comprehensive research paper meaning

How to Write a Comprehensive Review

What is a research paper or article worth? The answer to this depends on many factors. But the short answer is: if you’re conducting a comprehensive review, you’re essentially assessing an article’s worth.

Research is critical to the evolution of modern science. By writing a research article, you’re immortalizing that research so others may continue it and build on top of it for many years to come. However, there’s a risk of not being published without a comprehensive review.

This article teaches you everything you should know when preparing to write a review and how to write a comprehensive one.

What You Should Know When Preparing for a Review

A comprehensive review requires a well-structured presentation of arguments and a high level of in-depth analysis because, in an article, you deal with a lot of reading, comparing, and contrasting. You want to start by reading the article quickly to get an idea of the main points, check the structure, and ensure it meets the requirements.

Next, you’ll want to think about how effectively the author proved their main points and arguments. Pay close attention to the article’s methods and materials to ensure the author’s arguments are defensible and support their ideas. Conduct any necessary research to validate the author’s main points . To do this, you may use database searches like Google Scholar and PubMed (focus on publications that are three years old at most ).

Finally, you’ll want to read through the article again. Decide whether you will read the article from start to finish or by following these steps:

• Start by reading the title, introductory part, headings, subheadings, abstract, opening sentences, and the conclusion. The beginning and end of an article are where the author includes the main points and arguments, so you’ll get a good idea of the main points by reading these parts first
• Then read the entire article once again.

Regardless of your choice, take detailed notes on inconsistencies, points that require further clarification, unanswered questions, or major areas of concern while reading (you’ll use these later). Note how the article comes across to a reader and ensure you touch on the following points:

• Did the author stay on topic?
• Does the article state the issue(s), idea(s), and claim(s) right off the bat? And are they clear?
• What kind of support does the article provide? (a credible solution, case studies, illustrations, etc.)
• Are the sources legitimate and properly cited?
• Is the author contributing to knowledge advancement? Has the topic been approached before, or is the author responding to another author’s work?

Types of Review

It’s important to distinguish between different types of review because this determines how you’ll conduct your research to provide a top-notch review. Some reputable peer-reviewed journals include review articles, and they can even have a lot of citations and a high impact factor . Below are the different types of review articles.

Journal Article Review

This type of review outlines the strengths and weaknesses of a publication. You must demonstrate the article’s value through a thorough analysis and interpretation.

Research Article Review

Slightly different from a journal review, a research article review evaluates the research method and compares it to the article’s analysis and critique.

Scientific Article Review

This type of review involves the review of any article within the realm of science. Scientific publications may include more information on the background necessary to help you provide a more comprehensive review.

Now you’re ready to start writing! Start a review by including a title (declarative, descriptive, or interrogative). Before moving on to the intro of your review, cite and identify the article, and include:

• The article’s title
• The journal’s title (if applicable)
• Year of publication.

Having a definite structure is crucial if you want your review to be as comprehensive as possible; therefore, you can outline your review or use a paper review template to organize your notes coherently. In the intro, you want to start by touching on the main strengths and weaknesses and include:

• Introducing the research topic and why there’s a need for it within the respective community or organization
• Summarizing the main points and relevant facts of the article
• Highlighting the positives (is the question interesting or vital, are the author’s methods appropriate?)
• Methodological flaws
• Critiques of any present gaps in research, unanswered questions, contradictions, or issues pertinent to future studies

The body is the main part of your review and should include comparisons and thorough analysis. At this point, include any previous notes you took while preparing for the review. There isn’t a word limit to this part of the review, but you must include as much or as little detail as each article deserves, paying special attention to:

• Qualitative vs. quantitative approaches
• The article’s specific objective or purpose
• The conclusion and its importance
• Chronology.    

For the conclusion, revisit your findings, critiques, and the article’s critical points while maintaining the focus established in the intro. Ensure the conclusion is short and to the point.

Post-Review

Now that your review is complete, check for errors, bad grammar, or awkwardly-phrased sentences. If your review is poorly written, it’ll be considered irrelevant, even if your ideas are qualitative.Remember to always be respectful of another author’s work . Refrain from writing a bad review, even if there are points that you disagree with or that anger or frustrate you. Instead, show examples of any errors or inconsistencies you find and politely suggest ideas about other aspects of the author’s research for their future works.

Orvium Makes it Simple For Reviewers

If writing a comprehensive review feels overwhelming at first, you may choose to look at other researchers’ or scholars’ article reviews. Or, better yet, consider using Orvium ! You can increase your interactions and engage with researchers and reviewers within your community and beyond. Orvium is the platform for all your publishing needs. You also have a chance to collaborate, showcase your profile, and track your impact on our platform . Want even more tips and tricks? Check out our blog .

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Roberto Rabasco

+10 years’ experience working for Deutsche Telekom, Just Eat or Asos. Leading, designing and developing high-availability software solutions, he built his own software house in '16

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Research Paper Structure: A Comprehensive Guide

Table of Contents

Writing a research paper is a daunting task, but understanding its structure can make the process more manageable and lead to a well-organized, coherent paper. This article provides a step-by-step approach to crafting a research paper, ensuring your work is not only informative but also structured for maximum impact.

Introduction

In any form of written communication, content structure plays a vital role in facilitating understanding. A well-structured research paper provides a framework that guides readers through the content, ensuring they grasp the main points efficiently. Without a clear structure, readers may become lost or confused, leading to a loss of interest and a failure to comprehend the intended message.

When it comes to research papers, structure is particularly important due to the complexity of the subject matter. Research papers often involve presenting and analyzing large amounts of data, theories, and arguments. Without a well-defined structure, readers may struggle to navigate through this information overload, resulting in a fragmented understanding of the topic.

How Structure Enhances Clarity and Coherence

A well-structured research paper not only helps readers follow the flow of ideas but also enhances the clarity and coherence of the content. By organizing information into sections, paragraphs, and sentences, researchers can present their thoughts logically and systematically. This logical organization allows readers to easily connect ideas, resulting in a more coherent and engaging reading experience.

One way in which structure enhances clarity is by providing a clear roadmap for readers to follow. By dividing the research paper into sections and subsections, researchers can guide readers through the different aspects of the topic. This allows readers to anticipate the flow of information and mentally prepare themselves for the upcoming content.

In addition, a well-structured research paper ensures that each paragraph serves a specific purpose and contributes to the overall argument or analysis. By clearly defining the main idea of each paragraph and providing supporting evidence or examples, researchers can avoid confusion and ensure that their points are effectively communicated.

Moreover, a structured research paper helps researchers maintain a consistent focus throughout their writing. By organizing their thoughts and ideas, researchers can ensure that they stay on track and avoid going off on tangents. This not only improves the clarity of the paper but also helps maintain the reader's interest and engagement.

Components of a Research Paper Structure

Title and abstract: the initial impression.

The title and abstract are the first elements readers encounter when accessing a research paper. The title should be concise, informative, and capture the essence of the study. For example, a title like "Exploring the Impact of Climate Change on Biodiversity in Tropical Rainforests" immediately conveys the subject matter and scope of the research. The abstract, on the other hand, provides a brief overview of the research problem, methodology, and findings, enticing readers to delve further into the paper. In a well-crafted abstract, researchers may highlight key results or implications of the study, giving readers a glimpse into the value of the research.

Introduction: Setting the Stage

The introduction serves as an invitation for readers to engage with the research paper. It should provide background information on the topic, highlight the research problem, and present the research question or thesis statement. By establishing the context and relevance of the study, the introduction piques readers' interest and prepares them for the content to follow. For instance, in a study on the impact of social media on mental health, the introduction may discuss the rise of social media platforms and the growing concerns about its effects on individuals' well-being. This contextual information helps readers understand the significance of the research and why it is worth exploring further.

Furthermore, the introduction may also outline the objectives of the study, stating what the researchers aim to achieve through their research. This helps readers understand the purpose and scope of the study, setting clear expectations for what they can expect to learn from the paper.

Literature Review: Building the Foundation

The literature review is a critical component of a research paper, as it demonstrates the researcher's understanding of existing knowledge and provides a foundation for the study. It involves reviewing and analyzing relevant scholarly articles, books, and other sources to identify gaps in research and establish the need for the current study. In a comprehensive literature review, researchers may summarize key findings from previous studies, identify areas of disagreement or controversy, and highlight the limitations of existing research.

Moreover, the literature review may also discuss theoretical frameworks or conceptual models that have been used in previous studies. By examining these frameworks, researchers can identify the theoretical underpinnings of their study and explain how their research fits within the broader academic discourse. This not only adds depth to the research paper but also helps readers understand the theoretical context in which the study is situated.

Methodology: Detailing the Process

The research design, data collection methods, and analysis techniques used in the study are described in the methodology section. It should be presented clearly and concisely, allowing readers to understand how the research was conducted and evaluated. A well-described methodology ensures the study's reliability and allows other researchers to replicate or build upon the findings.

Within the methodology section, researchers may provide a detailed description of the study population or sample, explaining how participants were selected and why they were chosen. This helps readers understand the generalizability of the findings and the extent to which they can be applied to a broader population.

In addition, researchers may also discuss any ethical considerations that were taken into account during the study. This could include obtaining informed consent from participants, ensuring confidentiality and anonymity, and following ethical guidelines set by relevant professional organizations. By addressing these ethical concerns, researchers demonstrate their commitment to conducting research in an ethical and responsible manner.

Results: Presenting the Findings

The results section represents the study findings. Researchers should organize their results in a logical manner, using tables, graphs, and descriptive statistics to support their conclusions. The results should be presented objectively, without interpretation or analysis. For instance, for a study on the effectiveness of a new drug in treating a specific medical condition, researchers may present the percentage of patients who experienced positive outcomes, along with any statistical significance associated with the results.

In addition to presenting the main findings, researchers may also include supplementary data or sub-analyses that provide further insights into the research question. This could include subgroup analyses, sensitivity analyses, or additional statistical tests that help explore the robustness of the findings.

Discussion: Interpreting the Results

In the discussion section, researchers analyze and interpret the results in light of the research question or thesis statement. This is an opportunity to explore the implications of the findings, compare them with existing literature, and offer insights into the broader significance of the study. The discussion should be supported by evidence and it is advised to avoid speculation.

Researchers may also discuss the limitations of their study, acknowledging any potential biases or confounding factors that may have influenced the results. By openly addressing these limitations, researchers demonstrate their commitment to transparency and scientific rigor.

Conclusion: Wrapping It Up

The conclusion provides a concise summary of the research paper, restating the main findings and their implications. It should also reflect on the significance of the study and suggest potential avenues for future research. A well-written conclusion leaves a lasting impression on readers, highlighting the importance of the research and its potential impact. By summarizing the key takeaways from the study, researchers ensure that readers walk away with a clear understanding of the research's contribution to the field.

Tips for Organizing Your Research Paper

Starting with a strong thesis statement.

A strong and clear thesis statement serves as the backbone of your research paper. It provides focus and direction, guiding the organization of ideas and arguments throughout the paper. Take the time to craft a well-defined thesis statement that encapsulates the core message of your research.

Creating an Outline: The Blueprint of Your Paper

An outline acts as a blueprint for your research paper, ensuring a logical flow of ideas and preventing disorganization. Divide your paper into sections and subsections, noting the main points and supporting arguments for each. This will help you maintain coherence and clarity throughout the writing process.

Balancing Depth and Breadth in Your Paper

When organizing your research paper, strike a balance between delving deeply into specific points and providing a broader overview. While depth is important for thorough analysis, too much detail can overwhelm readers. Consider your target audience and their level of familiarity with the topic to determine the appropriate level of depth and breadth for your paper.

By understanding the importance of research paper structure and implementing effective organizational strategies, researchers can ensure their work is accessible, engaging, and influential. A well-structured research paper not only communicates ideas clearly but also enhances the overall impact of the study. With careful planning and attention to detail, researchers can master the art of structuring their research papers, making them a valuable contribution to their field of study.

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Writing a comprehensive APA format research paper

Aug 2, 2019 | research paper , Writing

Every semester students are supposed to write different pares. Some of these assignments are research papers that hinge on different topics. What’s more, these research papers have to be written in different formats. The research paper format that you write depends on the preference of the instructor or the institution at large. There are some institutions, which require the student to write all his papers in a specific format, as a way of creating a good academic writing identity. One of those formats is the APA, or the American Psychological Association.

When you write a research paper with APA format, there are guidelines you are supposed to follow. These guidelines are the ones that set the paper apart from the rest of the academic writing formats. Students have to master the guidelines and ensure that their papers are not only excellent in writing, but also they are free from plagiarism . This article is dedicated to helping you in knowing and understanding how to APA format our research paper. This regards the structuring content, spacing, margins, in-text citations as well as the references list. These aspects are crucial for the success of any research paper with APA format.

The APA format of writing research papers has been used widely in areas of psychology, business, sociology, economics, and medicine. At face value, the task of writing a research paper with APA format can seem daunting, but it all comes down to how you divide your paper into the right sections, following every single and basic rules of APA formatting paper.

The universal rules of formatting your research paper in APA style

Before even proceeding further, it is important to look at the universal guidelines that apply anytime you format APA research papers. They include:

All the margins in your research paper must be one inch. The margin is the space between the edges of the paper and where the text starts. This applies on all sides, meaning the right, left, bottom, and top margins ought to be one inch. You need not worry about this because it is the default setting in Ms. Word.

When using apa formatting paper rules, this style prefers the 12-point Times New Roman font. The lines in the body of the paper must be double-spaced, and the first indent of 0.5 inches.

When writing a research paper with apa format, you have to ensure that all pages have a running head. This should be put in capital letters and should not exceed 50 characters, including spaces. Make sure that on the first page of your research paper, the running head is preceded by “RUNNING HEAD:” For the rest of the pages, you can leave the “RUNNING HEAD.”

In apa formatting paper rules, numbering ought to start from the first page. These numbers ought to be inserted manually and should not have your name or any other identifying information on them. They are just plain page numbers.

Having the universal rules in mind, you can now see how your paper ought to be formatted in the APA style.

The title page and the abstract

When it comes to a research paper with apa format, everything should be in 12-point font size and double spaced. All margins should be one inch, and this is the basic layout that you will use for the rest of your paper. The title that you formulate for your paper must be brief. It is recommended by format apa rules that the title should be to the point, short and precise. The best length is ten to twelve words. This will give the audience an exact idea of what your paper is all about. The title ought to appear at the centre of the page.

Directly below the title comes your name and that of your institution. This should look like this:

Do not forget to include the running head because it is a brief synopsis of the title of your research paper. The page numbers ought to be at the top right corner of your paper and should be set to automatically show on every page of that document.

The abstract comes next after the title page, and you have to ensure that you indicate the word “Abstract” without the quotation marks. Do not write in italics or modify it in any other way. It should be centred and should come in the opening line of the abstract page. The abstract is usually a one-paragraph write up that is double-spaced. It summarizes the major points of your research paper. When using apa formatting paper style, you cannot ident your abstract.

Writing the main body of your APA research paper

Remember that wring a research paper with apa format is what sets it apart from the rest of the academic writings. When it comes to how to apa format your research paper, you need to consider the following aspects:

Every academic paper must have an introduction. When it comes to a research paper with apa format, you can write the introduction paragraph on a new page. Here, you are summarizing your topic for the audience and showing its relevance to the existing research. It also indicates how you inferred our hypothesis. You have to ensure it is catchy to avoid boring the audience. An APA style introduction to a research paper is written in terms of ideas

The methods section of the research paper with apa format should be labelled in bold. Methods section comes after the introduction. This is where you give a simple explanation of your research design. You can have sections that describe the participants, materials and procedures that you used in your research. There should be no page breaks between the subsections of your Method section. To make it even easier for you, label the subsections as Participants, Materials, and Procedures in bold letters. This section helps the audience to replicate the study and the methods if they so wish.

The word “Results” should be written in bold and flushed to the center. This should include the statics that analyzes your study. When it comes to formatting statistics in your apa formatting paper, you can consult your lecturer or the APA guidelines for specificity. If you have any supplementary materials like graphs, tables and so on, you can refer to them.

This is where you show the relevance and importance of your work to the audience. Label this section as the “Discussion” in bold and centred. It should come right after the results section of your research paper with apa format. You have to discuss whether or not your findings align with your hypothesis and show the limits of your research. Suggest the area that future research can concentrate on based on your findings.

Do you need help in writing APA format research paper? Consult our top writers

Making apa in-text citations in your research paper.

Citations are very important when writing a research paper with apa format. You have to ensure there are enough in-text citations where you have used a paraphrase, summary or a quote from another source. The guiding rule here is that for every in-text citation you make in your research paper with apa format, it must correspond with the entry in the reference list.

When making in-text citations format apa, the last name of the author comes first, and the year of publication. For instance, (Field, 2004). When using direct quotations from a source, you have to include the page number. For instance, (Field, 2004, p. 12).

When it comes to using websites and e-books without page numbers, the apa formatting paper rules dictate that you must use a paragraph number

When it comes to making in-text citations for web pages, you have to do it as you would for any other source. However, if the name of the author is no available, the title and the date should be used in the citation. The in-text citation that you make should also lead the audience to the corresponding entry in the reference list. When making citations for sources with no dates, you ought to use n.d (meaning no date). For instance, it can read (Field, n.d.).

In-text capitalization, Quotes, underlining and italics

When writing your research paper with apa format, you need to pay attention to the following rules:

Finalizing your APA research paper

Now you know what you are supposed to do when it comes to writing a research paper with apa format. This is how you apply the final touches to ensure the paper conforms to the guidelines of the APA style.

Every source that you have used in your paper must be outlined in the Reference List. This should be put on a new page. The list should be full of bibliographical information for the references. The Reference should be written in bold and centred. The reference list should follow the alphabetical order based on the last name of the author.

Ensure there is no extra space between the references. You only put the normal double-space. The reference entries should use the hanging indentation. Anything that you have cited in the body of your paper must appear in the reference list and vice versa. Do not try to make any reference entry that you have not used in the body of your paper.

If you use any table or figure in your paper, ensure it falls on its page. However, sometimes instructors may require the student to include tables and figures in the boy of their research paper. If you are not sure about this, you have to consult with your instructor.

Common mistakes that students ought to avoid when writing an APA research paper

There is nothing bad in academic writing than overlooking that overlooking some common mistakes. If a student is writing an A-grade research paper with apa format, he needs to be aware of the following mistakes so that he can avoid them.

For your research paper to be successful, you need to formulate a well-defined thesis statement . This is what sets up the expectations for your audience and creates the focus of your paper. If you do not come up with an effective thesis statement, your paper will fall short of achieving its initial purpose. Make your thesis clear and precise.

Sometimes the teacher may give the word limit for such an assignment. As such, you need to ensure that you express yourself based on the topic within this limit. Do not try to exceed the suggested word count. If you do, it should not be by many words and should not interfere with the strength of your argument. The same case applies to fewer words than the expected word limit. What is important here is to ensure that your research paper with apa format meets the word count and makes more definitive statements.

You need to ensure that your in-text citations follow the apa formatting paper rules. This is why it is essential to proofread your paper section by section to ensure it meets the APA in-text citation rules.

Writing a research paper with apa format is now comfortable with the above steps. You can also hire our professional writers to help you with this format.

Need help in writing APA format research paper? Our expert writers are here to help

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Home » Research Paper – Structure, Examples and Writing Guide

Research Paper – Structure, Examples and Writing Guide

Table of Contents

Research Paper

Definition:

Research Paper is a written document that presents the author’s original research, analysis, and interpretation of a specific topic or issue.

It is typically based on Empirical Evidence, and may involve qualitative or quantitative research methods, or a combination of both. The purpose of a research paper is to contribute new knowledge or insights to a particular field of study, and to demonstrate the author’s understanding of the existing literature and theories related to the topic.

Structure of Research Paper

The structure of a research paper typically follows a standard format, consisting of several sections that convey specific information about the research study. The following is a detailed explanation of the structure of a research paper:

The title page contains the title of the paper, the name(s) of the author(s), and the affiliation(s) of the author(s). It also includes the date of submission and possibly, the name of the journal or conference where the paper is to be published.

The abstract is a brief summary of the research paper, typically ranging from 100 to 250 words. It should include the research question, the methods used, the key findings, and the implications of the results. The abstract should be written in a concise and clear manner to allow readers to quickly grasp the essence of the research.

Introduction

The introduction section of a research paper provides background information about the research problem, the research question, and the research objectives. It also outlines the significance of the research, the research gap that it aims to fill, and the approach taken to address the research question. Finally, the introduction section ends with a clear statement of the research hypothesis or research question.

Literature Review

The literature review section of a research paper provides an overview of the existing literature on the topic of study. It includes a critical analysis and synthesis of the literature, highlighting the key concepts, themes, and debates. The literature review should also demonstrate the research gap and how the current study seeks to address it.

The methods section of a research paper describes the research design, the sample selection, the data collection and analysis procedures, and the statistical methods used to analyze the data. This section should provide sufficient detail for other researchers to replicate the study.

The results section presents the findings of the research, using tables, graphs, and figures to illustrate the data. The findings should be presented in a clear and concise manner, with reference to the research question and hypothesis.

The discussion section of a research paper interprets the findings and discusses their implications for the research question, the literature review, and the field of study. It should also address the limitations of the study and suggest future research directions.

The conclusion section summarizes the main findings of the study, restates the research question and hypothesis, and provides a final reflection on the significance of the research.

The references section provides a list of all the sources cited in the paper, following a specific citation style such as APA, MLA or Chicago.

How to Write Research Paper

You can write Research Paper by the following guide:

• Choose a Topic: The first step is to select a topic that interests you and is relevant to your field of study. Brainstorm ideas and narrow down to a research question that is specific and researchable.
• Conduct a Literature Review: The literature review helps you identify the gap in the existing research and provides a basis for your research question. It also helps you to develop a theoretical framework and research hypothesis.
• Develop a Thesis Statement : The thesis statement is the main argument of your research paper. It should be clear, concise and specific to your research question.
• Plan your Research: Develop a research plan that outlines the methods, data sources, and data analysis procedures. This will help you to collect and analyze data effectively.
• Collect and Analyze Data: Collect data using various methods such as surveys, interviews, observations, or experiments. Analyze data using statistical tools or other qualitative methods.
• Organize your Paper : Organize your paper into sections such as Introduction, Literature Review, Methods, Results, Discussion, and Conclusion. Ensure that each section is coherent and follows a logical flow.
• Write your Paper : Start by writing the introduction, followed by the literature review, methods, results, discussion, and conclusion. Ensure that your writing is clear, concise, and follows the required formatting and citation styles.
• Edit and Proofread your Paper: Review your paper for grammar and spelling errors, and ensure that it is well-structured and easy to read. Ask someone else to review your paper to get feedback and suggestions for improvement.
• Cite your Sources: Ensure that you properly cite all sources used in your research paper. This is essential for giving credit to the original authors and avoiding plagiarism.

Research Paper Example

Note : The below example research paper is for illustrative purposes only and is not an actual research paper. Actual research papers may have different structures, contents, and formats depending on the field of study, research question, data collection and analysis methods, and other factors. Students should always consult with their professors or supervisors for specific guidelines and expectations for their research papers.

Research Paper Example sample for Students:

Title: The Impact of Social Media on Mental Health among Young Adults

Abstract: This study aims to investigate the impact of social media use on the mental health of young adults. A literature review was conducted to examine the existing research on the topic. A survey was then administered to 200 university students to collect data on their social media use, mental health status, and perceived impact of social media on their mental health. The results showed that social media use is positively associated with depression, anxiety, and stress. The study also found that social comparison, cyberbullying, and FOMO (Fear of Missing Out) are significant predictors of mental health problems among young adults.

Introduction: Social media has become an integral part of modern life, particularly among young adults. While social media has many benefits, including increased communication and social connectivity, it has also been associated with negative outcomes, such as addiction, cyberbullying, and mental health problems. This study aims to investigate the impact of social media use on the mental health of young adults.

Literature Review: The literature review highlights the existing research on the impact of social media use on mental health. The review shows that social media use is associated with depression, anxiety, stress, and other mental health problems. The review also identifies the factors that contribute to the negative impact of social media, including social comparison, cyberbullying, and FOMO.

Methods : A survey was administered to 200 university students to collect data on their social media use, mental health status, and perceived impact of social media on their mental health. The survey included questions on social media use, mental health status (measured using the DASS-21), and perceived impact of social media on their mental health. Data were analyzed using descriptive statistics and regression analysis.

Results : The results showed that social media use is positively associated with depression, anxiety, and stress. The study also found that social comparison, cyberbullying, and FOMO are significant predictors of mental health problems among young adults.

Discussion : The study’s findings suggest that social media use has a negative impact on the mental health of young adults. The study highlights the need for interventions that address the factors contributing to the negative impact of social media, such as social comparison, cyberbullying, and FOMO.

Conclusion : In conclusion, social media use has a significant impact on the mental health of young adults. The study’s findings underscore the need for interventions that promote healthy social media use and address the negative outcomes associated with social media use. Future research can explore the effectiveness of interventions aimed at reducing the negative impact of social media on mental health. Additionally, longitudinal studies can investigate the long-term effects of social media use on mental health.

Limitations : The study has some limitations, including the use of self-report measures and a cross-sectional design. The use of self-report measures may result in biased responses, and a cross-sectional design limits the ability to establish causality.

Implications: The study’s findings have implications for mental health professionals, educators, and policymakers. Mental health professionals can use the findings to develop interventions that address the negative impact of social media use on mental health. Educators can incorporate social media literacy into their curriculum to promote healthy social media use among young adults. Policymakers can use the findings to develop policies that protect young adults from the negative outcomes associated with social media use.

References :

• Twenge, J. M., & Campbell, W. K. (2019). Associations between screen time and lower psychological well-being among children and adolescents: Evidence from a population-based study. Preventive medicine reports, 15, 100918.
• Primack, B. A., Shensa, A., Escobar-Viera, C. G., Barrett, E. L., Sidani, J. E., Colditz, J. B., … & James, A. E. (2017). Use of multiple social media platforms and symptoms of depression and anxiety: A nationally-representative study among US young adults. Computers in Human Behavior, 69, 1-9.
• Van der Meer, T. G., & Verhoeven, J. W. (2017). Social media and its impact on academic performance of students. Journal of Information Technology Education: Research, 16, 383-398.

Appendix : The survey used in this study is provided below.

Social Media and Mental Health Survey

• How often do you use social media per day?
• Less than 30 minutes
• 30 minutes to 1 hour
• 1 to 2 hours
• 2 to 4 hours
• More than 4 hours
• Which social media platforms do you use?
• Others (Please specify)
• How often do you experience the following on social media?
• Social comparison (comparing yourself to others)
• Cyberbullying
• Fear of Missing Out (FOMO)
• Have you ever experienced any of the following mental health problems in the past month?
• Do you think social media use has a positive or negative impact on your mental health?
• Very positive
• Somewhat positive
• Somewhat negative
• Very negative
• In your opinion, which factors contribute to the negative impact of social media on mental health?
• Social comparison
• In your opinion, what interventions could be effective in reducing the negative impact of social media on mental health?
• Education on healthy social media use
• Counseling for mental health problems caused by social media
• Social media detox programs
• Regulation of social media use

Thank you for your participation!

Applications of Research Paper

Research papers have several applications in various fields, including:

• Advancing knowledge: Research papers contribute to the advancement of knowledge by generating new insights, theories, and findings that can inform future research and practice. They help to answer important questions, clarify existing knowledge, and identify areas that require further investigation.
• Informing policy: Research papers can inform policy decisions by providing evidence-based recommendations for policymakers. They can help to identify gaps in current policies, evaluate the effectiveness of interventions, and inform the development of new policies and regulations.
• Improving practice: Research papers can improve practice by providing evidence-based guidance for professionals in various fields, including medicine, education, business, and psychology. They can inform the development of best practices, guidelines, and standards of care that can improve outcomes for individuals and organizations.
• Educating students : Research papers are often used as teaching tools in universities and colleges to educate students about research methods, data analysis, and academic writing. They help students to develop critical thinking skills, research skills, and communication skills that are essential for success in many careers.
• Fostering collaboration: Research papers can foster collaboration among researchers, practitioners, and policymakers by providing a platform for sharing knowledge and ideas. They can facilitate interdisciplinary collaborations and partnerships that can lead to innovative solutions to complex problems.

When to Write Research Paper

Research papers are typically written when a person has completed a research project or when they have conducted a study and have obtained data or findings that they want to share with the academic or professional community. Research papers are usually written in academic settings, such as universities, but they can also be written in professional settings, such as research organizations, government agencies, or private companies.

Here are some common situations where a person might need to write a research paper:

• For academic purposes: Students in universities and colleges are often required to write research papers as part of their coursework, particularly in the social sciences, natural sciences, and humanities. Writing research papers helps students to develop research skills, critical thinking skills, and academic writing skills.
• For publication: Researchers often write research papers to publish their findings in academic journals or to present their work at academic conferences. Publishing research papers is an important way to disseminate research findings to the academic community and to establish oneself as an expert in a particular field.
• To inform policy or practice : Researchers may write research papers to inform policy decisions or to improve practice in various fields. Research findings can be used to inform the development of policies, guidelines, and best practices that can improve outcomes for individuals and organizations.
• To share new insights or ideas: Researchers may write research papers to share new insights or ideas with the academic or professional community. They may present new theories, propose new research methods, or challenge existing paradigms in their field.

Purpose of Research Paper

The purpose of a research paper is to present the results of a study or investigation in a clear, concise, and structured manner. Research papers are written to communicate new knowledge, ideas, or findings to a specific audience, such as researchers, scholars, practitioners, or policymakers. The primary purposes of a research paper are:

• To contribute to the body of knowledge : Research papers aim to add new knowledge or insights to a particular field or discipline. They do this by reporting the results of empirical studies, reviewing and synthesizing existing literature, proposing new theories, or providing new perspectives on a topic.
• To inform or persuade: Research papers are written to inform or persuade the reader about a particular issue, topic, or phenomenon. They present evidence and arguments to support their claims and seek to persuade the reader of the validity of their findings or recommendations.
• To advance the field: Research papers seek to advance the field or discipline by identifying gaps in knowledge, proposing new research questions or approaches, or challenging existing assumptions or paradigms. They aim to contribute to ongoing debates and discussions within a field and to stimulate further research and inquiry.
• To demonstrate research skills: Research papers demonstrate the author’s research skills, including their ability to design and conduct a study, collect and analyze data, and interpret and communicate findings. They also demonstrate the author’s ability to critically evaluate existing literature, synthesize information from multiple sources, and write in a clear and structured manner.

Characteristics of Research Paper

Research papers have several characteristics that distinguish them from other forms of academic or professional writing. Here are some common characteristics of research papers:

• Evidence-based: Research papers are based on empirical evidence, which is collected through rigorous research methods such as experiments, surveys, observations, or interviews. They rely on objective data and facts to support their claims and conclusions.
• Structured and organized: Research papers have a clear and logical structure, with sections such as introduction, literature review, methods, results, discussion, and conclusion. They are organized in a way that helps the reader to follow the argument and understand the findings.
• Formal and objective: Research papers are written in a formal and objective tone, with an emphasis on clarity, precision, and accuracy. They avoid subjective language or personal opinions and instead rely on objective data and analysis to support their arguments.
• Citations and references: Research papers include citations and references to acknowledge the sources of information and ideas used in the paper. They use a specific citation style, such as APA, MLA, or Chicago, to ensure consistency and accuracy.
• Peer-reviewed: Research papers are often peer-reviewed, which means they are evaluated by other experts in the field before they are published. Peer-review ensures that the research is of high quality, meets ethical standards, and contributes to the advancement of knowledge in the field.
• Objective and unbiased: Research papers strive to be objective and unbiased in their presentation of the findings. They avoid personal biases or preconceptions and instead rely on the data and analysis to draw conclusions.

Advantages of Research Paper

Research papers have many advantages, both for the individual researcher and for the broader academic and professional community. Here are some advantages of research papers:

• Contribution to knowledge: Research papers contribute to the body of knowledge in a particular field or discipline. They add new information, insights, and perspectives to existing literature and help advance the understanding of a particular phenomenon or issue.
• Opportunity for intellectual growth: Research papers provide an opportunity for intellectual growth for the researcher. They require critical thinking, problem-solving, and creativity, which can help develop the researcher’s skills and knowledge.
• Career advancement: Research papers can help advance the researcher’s career by demonstrating their expertise and contributions to the field. They can also lead to new research opportunities, collaborations, and funding.
• Academic recognition: Research papers can lead to academic recognition in the form of awards, grants, or invitations to speak at conferences or events. They can also contribute to the researcher’s reputation and standing in the field.
• Impact on policy and practice: Research papers can have a significant impact on policy and practice. They can inform policy decisions, guide practice, and lead to changes in laws, regulations, or procedures.
• Advancement of society: Research papers can contribute to the advancement of society by addressing important issues, identifying solutions to problems, and promoting social justice and equality.

Limitations of Research Paper

Research papers also have some limitations that should be considered when interpreting their findings or implications. Here are some common limitations of research papers:

• Limited generalizability: Research findings may not be generalizable to other populations, settings, or contexts. Studies often use specific samples or conditions that may not reflect the broader population or real-world situations.
• Potential for bias : Research papers may be biased due to factors such as sample selection, measurement errors, or researcher biases. It is important to evaluate the quality of the research design and methods used to ensure that the findings are valid and reliable.
• Ethical concerns: Research papers may raise ethical concerns, such as the use of vulnerable populations or invasive procedures. Researchers must adhere to ethical guidelines and obtain informed consent from participants to ensure that the research is conducted in a responsible and respectful manner.
• Limitations of methodology: Research papers may be limited by the methodology used to collect and analyze data. For example, certain research methods may not capture the complexity or nuance of a particular phenomenon, or may not be appropriate for certain research questions.
• Publication bias: Research papers may be subject to publication bias, where positive or significant findings are more likely to be published than negative or non-significant findings. This can skew the overall findings of a particular area of research.
• Time and resource constraints: Research papers may be limited by time and resource constraints, which can affect the quality and scope of the research. Researchers may not have access to certain data or resources, or may be unable to conduct long-term studies due to practical limitations.

About the author

Muhammad Hassan

Researcher, Academic Writer, Web developer

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How to Write a Research Paper

Undergrads often write research papers each semester, causing stress. Yet, it’s simpler than believing if you know how to write a research paper . Divide the task, get tips, a plan, and tools for an outstanding paper. Simplify research, writing, topic choice, and illustration use!

A research paper is an academic document that involves deep, independent research to offer analysis, interpretation, and argument. Unlike academic essays, research papers are lengthier and more detailed, aiming to evaluate your writing and scholarly research abilities. To write one, you must showcase expertise in your subject, interact with diverse sources, and provide a unique perspective to the discussion. 

Research papers are a foundational element of contemporary science and the most efficient means of disseminating knowledge throughout a broad network. Nonetheless, individuals usually encounter research papers during their education; they are frequently employed in college courses to assess a student’s grasp of a specific field or their aptitude for research. 

Given their significance, research papers adopt a research paper format – a formal, unadorned style that eliminates any subjective influence from the writing. Scientists present their discoveries straightforwardly, accompanied by relevant supporting proof, enabling other researchers to integrate the paper into their investigations.

This guide leads you through every steps to write a research paper , from grasping your task to refining your ultimate draft and will teach you how to write a research paper.

Understanding The Research Paper

A research paper is a meticulously structured document that showcases the outcomes of an inquiry, exploration, or scrutiny undertaken on a specific subject. It embodies a formal piece of academic prose that adds novel information, perspectives, or interpretations to a particular domain of study. Typically authored by scholars, researchers, scientists, or students as part of their academic or professional pursuits, these papers adhere to a well-defined format. This research paper format encompasses an introduction, literature review, methodology, results, discussion, and conclusion. 

The introduction provides context and outlines the study’s significance, while the literature review encapsulates existing research and situates the study within the broader academic discourse. The methodology section elucidates the research process, encompassing data collection and analysis techniques. Findings are presented in the results section, often complemented by graphical and statistical representations. Interpretation of findings, implications, and connection to existing knowledge transpire in the discussion section. 

Ultimately, the conclusion encapsulates pivotal discoveries and their wider import.

Research papers wield immense significance in advancing knowledge across diverse disciplines, enabling researchers to disseminate findings, theories, and revelations to a broader audience. Before publication in academic journals or presentations at conferences, these papers undergo a stringent peer review process conducted by domain experts, ensuring their integrity, precision, and worth.

Academic and non-academic research papers diverge across several dimensions. Academic papers are crafted for scholarly circles to expand domain knowledge and theories. They maintain a formal, objective tone and heavily rely on peer-reviewed sources for credibility. In contrast, non-academic papers, employing a more flexible writing style, target a broader audience or specific practical goals. These papers might incorporate persuasive language, anecdotes, and various sources beyond academia. While academic papers rigorously adhere to structured formats and established citation styles, non-academic papers prioritize practicality, adapting their structure and citation methods to suit the intended readership.

The purpose of a research paper revolves around offering fresh insights, knowledge, or interpretations within a specific field. This formal document serves as a conduit for scholars, researchers, scientists, and students to communicate their investigative findings and actively contribute to the ongoing academic discourse.

Research Paper Writing Process – How To Write a Good Research Paper

Selecting a suitable research topic .

Your initial task is to thoroughly review the assignment and carefully absorb the writing prompt’s details. Pay particular attention to technical specifications like length, formatting prerequisites (such as single- vs. double-spacing, indentation, etc.), and the required citation style. Also, pay attention to specifics, including an abstract or a cover page.

Once you’ve a clear understanding of the assignment, the subsequent steps to write a research paper are aligned with the conventional writing process. However, remember that research papers have rules, adding some extra considerations to the process.

When given some assignment freedom, the crucial task of choosing a topic rests on you. Despite its apparent simplicity, this choice sets the foundation for your entire research paper, shaping its direction. The primary factor in picking a research paper topic is ensuring it has enough material to support it. Your chosen topic should provide ample data and complexity for a thorough discussion. However, it’s important to avoid overly broad subjects and focus on specific ones that cover all relevant information without gaps. Yet, approach topic selection more slowly; choosing something that genuinely interests you is still valuable. Aim for a topic that meets both criteria—delivering substantial content while maintaining engagement.

Conducting Thorough Research 

Commence by delving into your research early to refine your topic and shape your thesis statement. Swift engagement with available research aids in dispelling misconceptions and unveils optimal paths and strategies to gather more material. Typically, research sources can be located either online or within libraries. When navigating online sources, exercise caution and opt for reputable outlets such as scientific journals or academic papers. Specific search engines, outlined below in the Tools and Resources section, exclusively enable exploring accredited sources and academic databases.

While pursuing information, it’s essential to differentiate between primary and secondary sources. Primary sources entail firsthand accounts, encompassing published articles or autobiographies, while secondary sources, such as critical reviews or secondary biographies, are more distanced. Skimming sources instead of reading each part proves more efficient during the research phase. If a source shows promise, set it aside for more in-depth reading later. Doing so prevents you from investing excessive time in sources that won’t contribute substantively to your work. You should present a literature review detailing your references and submit them for validation in certain instances. 

Organizing And Structuring The Research Paper

According to the research paper format , an outline for a research paper is a catalogue of essential topics, arguments, and evidence you intend to incorporate. These elements are divided into sections with headings, offering a preliminary overview of the paper’s structure before commencing the writing process. Formulating a structural outline can significantly enhance writing efficiency, warranting an investment of time to establish one.

Start by generating a list encompassing crucial categories and subtopics—a preliminary outline. Reflect on the amassed information while gathering supporting evidence, pondering the most effective means of segregation and categorization.

Once a discussion list is compiled, deliberate on the optimal information presentation sequence and identify related subtopics that should be placed adjacent. Consider if any subtopic loses coherence when presented out of order. Adopting a chronological arrangement can be suitable if the information follows a straightforward trajectory.

Given the potential complexity of research papers, consider breaking down the outline into paragraphs. This aids in maintaining organization when dealing with copious information and provides better control over the paper’s progression. Rectifying structural issues during the outline phase is preferable to addressing them after writing.

Remember to incorporate supporting evidence within the outline. Since there’s likely a substantial amount to include, outlining helps prevent overlooking crucial elements.

Writing The Introduction

According to the research paper format , the introduction of a research paper must address three fundamental inquiries: What, why, and how? Upon completing the introduction, the reader should clearly understand the paper’s subject matter, its relevance, and the approach you’ll use to construct your arguments.

What? Offer precise details regarding the paper’s topic, provide context, and elucidate essential terminology or concepts.

Why? This constitutes the most crucial yet challenging aspect of the introduction. Endeavour to furnish concise responses to the subsequent queries: What novel information or insights do you present? Which significant matters does your essay assist in defining or resolving?

How? To provide the reader with a preview of the paper’s forthcoming content, the introduction should incorporate a “guide” outlining the upcoming discussions. This entails briefly outlining the paper’s principal components in chronological sequence.

Developing The Main Body 

One of the primary challenges that many writers grapple with is effectively organizing the wealth of information they wish to present in their papers. This is precisely why an outline can be an invaluable tool. However, it’s essential to recognize that while an outline provides a roadmap, the writing process allows flexibility in determining the order in which information and arguments are introduced.

Maintaining cohesiveness throughout the paper involves anchoring your writing to the thesis statement and topic sentences. Here’s how to ensure a well-structured paper:

• Alignment with Thesis Statement: Regularly assess whether your topic sentences correspond with the central thesis statement. This ensures that your arguments remain on track and directly contribute to the overarching message you intend to convey.
• Consistency and Logical Flow: Review your topic sentences concerning one another. Do they follow a logical order that guides the reader through a coherent narrative? Ensuring a seamless flow from one topic to another helps maintain engagement and comprehension.
• Supporting Sentence Alignment: Each sentence within a paragraph should align with the topic sentence of that paragraph. This alignment reinforces the central idea, preventing tangential or disjointed discussions.

Additionally, identify paragraphs that cover similar content. While some overlap might be inevitable, it’s essential to approach shared topics from different angles, offering fresh insights and perspectives. Creating these nuanced differences helps present a well-rounded exploration of the subject matter.

An often-overlooked aspect of effective organization is the art of crafting smooth transitions. Transitions between sentences, paragraphs, and larger sections are the glue that holds your paper together. They guide the reader through the progression of ideas, enhancing clarity and creating a seamless reading experience.

Ultimately, while the struggle to organize information is accurate, employing these strategies not only aids in addressing the challenge but also contributes to the overall quality and impact of your writing.

Crafting A Strong Conclusion 

The purpose of the research paper’s conclusion is to guide your reader out of the realm of the paper’s argument, leaving them with a sense of closure.

Trace the paper’s trajectory, underscoring how all the elements converge to validate your thesis statement. Impart a sense of completion by ensuring the reader comprehends the resolution of the issues introduced in the paper’s introduction.

In addition, you can explore the broader implications of your argument, outline your paper’s contributions to future students studying the subject, and propose questions that your argument raises—ones that might not be addressed in the paper itself. However, it’s important to avoid:

• Introducing new arguments or crucial information that wasn’t covered earlier.
• Extending the conclusion unnecessarily.
• Employing common phrases that signal the decision (e.g., “In conclusion”).

By adhering to these guidelines, your conclusion can serve as a fitting and impactful conclusion to your research paper, leaving a lasting impression on your readers.

Refining The Research Paper

• Editing And Proofreading 

Eliminate unnecessary verbiage and extraneous content. In tandem with the comprehensive structure of your paper, focus on individual words, ensuring your language is robust. Verify the utilization of active voice rather than passive voice, and confirm that your word selection is precise and tangible.

The passive voice, exemplified by phrases like “I opened the door,” tends to convey hesitation and verbosity. In contrast, the active voice, as in “I opened the door,” imparts strength and brevity.

Each word employed in your paper should serve a distinct purpose. Strive to eschew the inclusion of surplus words solely to occupy space or exhibit sophistication.

For instance, the statement “The author uses pathos to appeal to readers’ emotions” is superior to the alternative “The author utilizes pathos to appeal to the emotional core of those who read the passage.”

Engage in thorough proofreading to rectify spelling, grammatical, and formatting inconsistencies. Once you’ve refined the structure and content of your paper, address any typographical and grammatical inaccuracies. Taking a break from your paper before proofreading can offer a new perspective.

Enhance error detection by reading your essay aloud. This not only aids in identifying mistakes but also assists in evaluating the flow. If you encounter sections that seem awkward during this reading, consider making necessary adjustments to enhance the overall coherence.

• Formatting And Referencing 

Citations are pivotal in distinguishing research papers from informal nonfiction pieces like personal essays. They serve the dual purpose of substantiating your data and establishing a connection between your research paper and the broader scientific community. Given their significance, citations are subject to precise formatting regulations; however, the challenge lies in the existence of multiple sets of rules.

It’s crucial to consult the assignment’s instructions to determine the required formatting style. Generally, academic research papers adhere to either of two formatting styles for source citations:

• MLA (Modern Language Association)
• APA (American Psychological Association)

Moreover, aside from MLA and APA styles, occasional demands might call for adherence to CMOS (The Chicago Manual of Style), AMA (American Medical Association), and IEEE (Institute of Electrical and Electronics Engineers) formats.

Initially, citations might appear intricate due to their numerous regulations and specific details. However, once you become adept at them, citing sources accurately becomes almost second nature. It’s important to note that each formatting style provides detailed guidelines for citing various sources, including photographs, websites, speeches, and YouTube videos.

Tips For Writing An Effective Research Paper 

By following these research paper writing tips , you’ll be well-equipped to create a well-structured, well-researched, and impactful research paper:

• Select a Clear and Manageable Topic: Choose a topic that is specific and focused enough to be thoroughly explored within the scope of your paper.
• Conduct In-Depth Research: Gather information from reputable sources such as academic journals, books, and credible websites. Take thorough notes to keep track of your sources.
• Create a Strong Thesis Statement: Craft a clear and concise thesis statement that outlines the main argument or purpose of your paper.
• Develop a Well-Structured Outline: Organize your ideas into a logical order by creating an outline that outlines the main sections and their supporting points.
• Compose a Captivating Introduction: Hook the reader with an engaging introduction that provides background information and introduces the thesis statement.
• Provide Clear and Relevant Evidence: Support your arguments with reliable and relevant evidence, such as statistics, examples, and expert opinions.
• Maintain Consistent Tone and Style: Keep a consistent tone and writing style throughout the paper, adhering to the formatting guidelines of your chosen citation style.
• Craft Coherent Paragraphs: Each paragraph should focus on a single idea or point, and transitions should smoothly guide the reader from one idea to the next.
• Use Active Voice: Write in the active voice to make your writing more direct and engaging.
• Revise and Edit Thoroughly: Proofread your paper for grammatical errors, spelling mistakes, and sentence structure. Revise for clarity and coherence.
• Seek Peer Feedback: Have a peer or instructor review your paper for feedback and suggestions.
• Cite Sources Properly: Accurately cite all sources using the required citation style (e.g., MLA, APA) to avoid plagiarism and give credit to original authors.
• Be Concise and Avoid Redundancy: Strive for clarity by eliminating unnecessary words and redundancies.
• Conclude Effectively: Summarize your main points and restate your thesis in the conclusion. Provide a sense of closure without introducing new ideas.
• Stay Organized: Keep track of your sources, notes, and drafts to ensure a structured and organized approach to the writing process.
• Proofread with Fresh Eyes: Take a break before final proofreading to review your paper with a fresh perspective, helping you catch any overlooked errors.
• Edit for Clarity: Ensure that your ideas are conveyed clearly and that your arguments are easy to follow.
• Ask for Feedback: Don’t hesitate to ask for feedback from peers, instructors, or writing centers to improve your paper further.

In conclusion, we’ve explored the essential steps to write a research paper . From selecting a focused topic to mastering the intricacies of citations, we’ve navigated through the key elements of this process.

It’s vital to recognize that adhering to the research paper writing tips is not merely a suggestion, but a roadmap to success. Each stage contributes to the overall quality and impact of your paper. By meticulously following these steps, you ensure a robust foundation for your research, bolster your arguments, and present your findings with clarity and conviction.

As you embark on your own research paper journey, I urge you to put into practice the techniques and insights shared in this guide. Don’t shy away from investing time in organization, thorough research, and precise writing. Embrace the challenge, for it’s through this process that your ideas take shape and your voice is heard within the academic discourse.

Remember, every exceptional research paper begins with a single step. And with each step you take, your ability to articulate complex ideas and contribute to your field of study grows. So, go ahead – apply these tips, refine your skills, and witness your research papers evolve into compelling narratives that inspire, inform, and captivate.

In the grand tapestry of academia, your research paper becomes a thread of insight, woven into the larger narrative of human knowledge. By embracing the writing process and nurturing your unique perspective, you become an integral part of this ever-expanding tapestry.

Happy writing, and may your research papers shine brightly, leaving a lasting mark on both your readers and the world of scholarship.

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Systematic Reviews and Meta-Analyses: Comprehensive Search

• Get Started
• Exploratory Search
• Where to Search
• How to Search

Grey Literature

• What about errata and retractions?
• Eligibility Screening
• Critical Appraisal
• Data Extraction
• Synthesis & Discussion
• Assess Certainty
• Share & Archive

A comprehensive search is a systematic effort to find all available evidence  to answer your specific question(s).

The validity and usefulness of a synthesis hinges, in part, on a high-quality comprehensive search. Like all the other stages of a systematic review and/or meta-analysis, the process itself should be replicable .

We cover this content across four subtabs:

(A) Where to Search  | (B) How to Search  |  (C) Grey Literature | (D) What about errata and retractions?

Reporting Guideline for Searching

PRISMA-S is a reporting guideline for the search strategy . It should be used in conjunction with a  systematic review and/or meta-analysis reporting guideline  (e.g., PRISMA). Using this guideline will help you ensure "each component of a search is completely reported and...reproducible".

This section of our Library Guide is informed by the PRISMA-S Reporting Guideline.

Overview of Comprehensive Searching

What are you searching for.

First identify the type of material that can answer your question - this may already be part of your eligibility criteria . For most research questions, you will likely need at least peer-reviewed empirical research.

Peer-Reviewed Empirical Research

In some cases, it may make sense to only include peer-reviewed research, or even a specific type of research like randomized controlled trials. Peer-reviewed research should be located systematically so that the search is replicable and comprehensiveness can be reasonably justified. Therefore, a comprehensive search for peer-reviewed literature takes place primarily in academic journal databases.  The where and how to search sections of this guide are primarily focused on searching in academic databases to find peer-reviewed research.

In other cases, grey literature may be required to properly answer a question. Grey literature is a broad term that varies across discipline . Some common examples of grey literature include unpublished research, conference proceedings, government publications, social media content, blogs, newspapers, datasets, etc. Grey literature can rudimentarily be defined as anything that is not peer-reviewed, empirical research . 

Because of this variation, finding grey lit in a systematic, transparent, and replicable manner can be challenging. Where you search will vary based on what kind of grey lit you're looking for - how you search will vary based on the options available within the interface or database. However, it is important to document your search terms and process to be as systematic, transparent, and replicable as possible.

Where to search?

Once you've identified what kind of material you're looking for, you can identify where to search. This will include academic journal databases at a minimum. Check out the Where to search tab for more!

How to search?

The design of your search strategy will depend on what you're looking for and where you're looking. Check out the How to search tab for more!

Methodological Guidance

• Health Sciences
• Animal, Food Sciences
• Social Sciences
• Environmental Sciences

Cochrane Handbook  -  Part 2: Core Methods

Chapter 4:  Searching and Selecting Studies  provides guidance for both the search and screening/review (link)

• 4.2.1 Role of information specialist/librarian
• 4.2.2 Minimizing bias
• 4.2.3 Studies versus reports of studies
• 4.3.1  Bibliographic databases
• 4.3.2  Ongoing studies and unpublished data sources
• 4.3.3  Trials registers and trials results registers 
• 4.3.4  Regulatory agency sources and clinical study reports
• 4.3.5  Other sources
• 4.4.1  Introduction to search strategies
• 4.4.2  Structure of a search strategy
• 4.4.3  Sensitivity versus precision
• 4.4.4  Controlled vocabulary and text words
• 4.4.5  Language , date , and document format
• 4.4.7  Search filters
• 4.4.6  Identifying fraudulent studies, other  retracted  publications,  errata , and comments 
• 4.4.8  Peer review  of search strategies
• 4.4.9  Alerts
• 4.4.10  Timing  of searches
• 4.4.11  When to stop searching 
• 4.5 Documenting and reporting the search process

SYREAF Protocols 

Step 2:  conducting a search.

Conducting systematic reviews of intervention questions I: Writing the review protocol, formulating the question and searching the literature.   O’Connor AM, Anderson KM, Goodell CK, Sargeant JM. Zoonoses Public Health. 2014 Jun;61 Suppl 1:28-38. doi: 10.1111/zph.12125. PMID: 24905994

Technical Manual for Performing Electronic Literature Searches in Food and Feed Safety.

Campbell -  MECCIR

C19 + C24. Planning the search  ( protocol )

C25. Searching specialist bibliographic databases ( protocol )

C26. Searching for different types of evidence  ( protocol )

C27. Searching trials registers  ( protocol )

C28. Searching for grey literature  ( protocol )

C29. Searching within other reviews ( protocol )

C30. Searching reference lists  ( protocol )

C31. Searching by contacting relevant individuals and organizations  ( protocol )

C32 Structuring search strategies for bibliographic databases ( review / final manuscript )

C33. Developing search strategies for bibliographic databases ( review / final manuscript )

C34. Using search filters  ( review / final manuscript )

C35. Restricting database searches ( protocol & review / final manuscript )

C36. Documenting the search process ( review / final manuscript )

C37. Rerunning searches ( review / final manuscript )

C38. Incorporating findings from rerun searches  ( review / final manuscript )

C48. Obtaining unpublished data ( protocol & review / final manuscript )

" Searching for Studies ", the Campbell information retrieval guide

CEE -  Guidelines and Standards for Evidence synthesis in Environmental Management

Section 5. conducting a search.

Key CEE Standards for Conduct and Reporting

5.2 Conducting the Search

5.3 Managing References and Recording the Search

5.4 Updating and Amending Searches

Reporting in Protocol and Final Manuscript

• Final Manuscript

In the Protocol |  PRISMA-P

Describe all intended information sources (item 9).

...such as electronic databases, contact with study authors, trial registers or  other grey literature  sources...with planned dates of coverage

Present draft of search strategy (Item 10)

Having a search strategy peer reviewed may help to increase its  comprehensiveness  or  decrease yield  where search terminology is unnecessarily broad.

In the Final Manuscript |  PRISMA

Information sources (item 6), essential items:.

• Specify the date when each source (such as database, register, website, organisation) was last searched or consulted.
• If bibliographic databases were searched, specify for each database its name (such as MEDLINE, CINAHL), the interface or platform through which the database was searched (such as Ovid, EBSCOhost), and the dates of coverage (where this information is provided).
• If study registers (such as ClinicalTrials.gov), regulatory databases (such as Drugs@FDA), and other online repositories (such as SIDER Side Effect Resource) were searched, specify the name of each source and any date restrictions that were applied.
• If websites , search engines , or other online sources were browsed or searched , specify the name and URL (uniform resource locator) of each source.
• If organisations or manufacturers were contacted to identify studies, specify the name of each source.
• If individuals were contacted to identify studies, specify the types of individuals contacted (such as authors of studies included in the review or researchers with expertise in the area).
• If reference lists were examined, specify the types of references examined (such as references cited in study reports included in the systematic review, or references cited in systematic review reports on the same or a similar topic).
• If cited or citing reference searched  (also called backwards and forward citation searching) were conducted, specify the bibliographic details of the reports to which citation searching was applied, the citation index or platform used (such as Web of Science), and the date the citation searching was done.
• If journals or conference proceedings were consulted, specify the names of each source, the dates covered and how they were searched (such as handsearching or browsing online).

Present the full search strategies (Item 7)

• Provide the full line by line search strategy as run in each database with a sophisticated interface (such as Ovid), or the sequence of terms that were used to search simpler interfaces, such as search engines or websites.
• Describe any limits applied to the search strategy (such as date or language) and justify these by linking back to the review’s eligibility criteria.
• If published approaches such as search filters designed to retrieve specific types of records (for example, filter for randomised trials) or search strategies from other systematic reviews , were used, cite them. If published approaches were adapted —for example, if existing search filters were amended— note the changes made .
• If natural language processing or text frequency analysis tools were used to identify or refine keywords, synonyms, or subject indexing terms to use in the search strategy, specify the tool(s) used.
• If a tool was used to automatically translate search strings for one database to another, specify the tool used.
• If the search strategy was validated —for example, by evaluating whether it could identify a set of clearly eligible studies—report the validation process used and specify which studies were included in the validation set.
• If the search strategy was peer reviewed , report the peer review process used and specify any tool used, such as the Peer Review of Electronic Search Strategies (PRESS) checklist.
• If the search strategy structure adopted was not based on a PICO-style approach, describe the final conceptual structure and any explorations that were undertaken to achieve it (for example, use of a multi-faceted approach that uses a series of searches, with different combinations of concepts, to capture a complex research question, or use of a variety of different search approaches to compensate for when a specific concept is difficult to define).

Database Name (Item 1)

Name each individual database searched, stating the platform for each...There is no single database that is able to provide a complete and accurate list of all studies...

Multi-Database Searching (Item 2)

If databases were searched simultaneously on a single platform, state the name of the platform, listing all of the databases searched...

Study Registries (Item 3)

List any study registries searched...study registries allow researchers to locate ongoing clinical trials and studies that may have gone unpublished

Online Resources and Browsing (Item 4)

Describe any online or print source purposefully searched or browsed (e.g., tables of contents, print conference proceedings, web sites), and how this was done...

Web search engines and specific websites

"... l ist all websites  searched, along with their corresponding  web address ...if authors used a  general search engine , authors should declare whether  steps were taken to reduce personalization bias ...if review teams choose to review a  limited set of results , it should be noted in the text, along with the  rationale..."

Conference proceedings:

"...authors must specify the  conference names , the  dates  of conferences included, and the  method used to search  the proceedings (i.e., browsing print abstract books or using an online source)..."

General browsing:

"When purposefully browsing, describe any  method used , the name of the journal or other source, and the time frame covered by the search, if applicable..."

Citation Searching (Item 5)

...can be complicated to describe, but the explanation should  clearly state the database  used...and describe  any other methods  used. Authors also must  cite the “base” article(s)  that citation searching was performed upon, either for examining cited or citing articles...

Personal Contact (Item 6)

Contact  methods may vary widely ...may include personal contact, web forms, email mailing lists, mailed letters, social media contacts, or other methods...[which are] inherently   difficult to reproduce , [so] researchers should attempt to  give as much detail as possible ...

Other Methods (Item 7)

... declare that the method was used , even if it may not be fully replicable...[include] other additional information sources or search methods used in the methods section and in any supplementary materials...

Full Search Strategies (Item 8)

It is important to document and report the search strategy  exactly as run ,   typically by  copying and pasting  the search strategy directly as entered into the search platform...repeat the database or resource name , database  platform or web address , and other details necessary to clearly describe the resource....Report the full search strategy in  supplementary materials  as described above. Describe and  link  to the location of the supplementary materials in the methods section.

Limits and Restrictions (Item 9)

...report any  limits or restrictions used or that no limits were used in the abstract, methods section, and in any supplementary materials, including the full search strategies (Item 8)...[and] the  justification  for any limits used...

Search Filters (Item 10)

...cite any search filter  used in the methods section and describe adaptations made to any filter. Include the  copied and pasted details  of any search filter used or adapted for use as part of the full search strategy (Item 8)...

Prior Work (Item 11)

Sometimes, authors  adapt or reuse  [previously published search strategies] for different systematic reviews...it is appropriate to  cite the original  publication(s) consulted.

Updates (Item 12)

If there are  no changes  in information sources and/or search  syntax  (Table  2 ), it is sufficient to indicate the  date the last search was run  in the methods section and in the supplementary materials. If there are  any changes in information sources and/or search syntax, the changes  should be indicated  (e.g., different set of databases, changes in search syntax, date restrictions) in the methods section... explain why  these changes were made... If authors use  email alerts  or  other methods  to update searches, these methods can be briefly described by indicating the  method used , the  frequency  of any updates, the name of the  database(s) used ...Report the methods used to update the searches in the methods section and the supplementary materials, as described above.

Dates of Searches (Item 13)

... date of the last search of the primary information sources used...the  time frame during which searches were conducted...the initial and/or  last update search  date with each complete search strategy in the supplementary materials...

Peer Review (Item 14)

Describe the use of  peer review  in the methods section.

Total Records (Item 15)

...report the total number of references retrieved from all sources, including updates...[such that] if a reader  tries to duplicate  a search from a systematic review, one would expect to  retrieve nearly the same results  when limiting to the timeframe in the original review...

Deduplication (Item 16)

...describe [the method] and cite any  software  or  technique  used...if duplicates were removed manually , authors should include a  description ...

In the PRISMA Flowchart

Search Summary Table

In addition to the items required by PRISMA and PRISMA-S,  Bethel, Rogers, and Abbot (2021)  recommend including a  search summary table  "containing the details of which  databases were searched , which  supplementary search methods  were used, and  where the included articles  were found."

[Bethel, Rogers, and Abbot (2021)  Search Summary Table Template ] 

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What is a Literature Review?

A literature or narrative review is a comprehensive review and analysis of the published literature on a specific topic or research question. The literature that is reviewed contains: books, articles, academic articles, conference proceedings, association papers, and dissertations. It contains the most pertinent studies and points to important past and current research and practices. It provides background and context, and shows how your research will contribute to the field. 

A literature review should: 

• Provide a comprehensive and updated review of the literature;
• Explain why this review has taken place;
• Articulate a position or hypothesis;
• Acknowledge and account for conflicting and corroborating points of view

From  S age Research Methods

Purpose of a Literature Review

A literature review can be written as an introduction to a study to:

• Demonstrate how a study fills a gap in research
• Compare a study with other research that's been done

Or it can be a separate work (a research article on its own) which:

• Organizes or describes a topic
• Describes variables within a particular issue/problem

Limitations of a Literature Review

Some of the limitations of a literature review are:

• It's a snapshot in time. Unlike other reviews, this one has beginning, a middle and an end. There may be future developments that could make your work less relevant.
• It may be too focused. Some niche studies may miss the bigger picture.
• It can be difficult to be comprehensive. There is no way to make sure all the literature on a topic was considered.
• It is easy to be biased if you stick to top tier journals. There may be other places where people are publishing exemplary research. Look to open access publications and conferences to reflect a more inclusive collection. Also, make sure to include opposing views (and not just supporting evidence).

Source: Grant, Maria J., and Andrew Booth. “A Typology of Reviews: An Analysis of 14 Review Types and Associated Methodologies.” Health Information & Libraries Journal, vol. 26, no. 2, June 2009, pp. 91–108. Wiley Online Library, doi:10.1111/j.1471-1842.2009.00848.x.

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Periodically, UT Libraries runs a workshop covering the basics and library support for literature reviews. While we try to offer these once per academic year, we find providing the recording to be helpful to community members who have missed the session. Following is the most recent recording of the workshop, Conducting a Literature Review. To view the recording, a UT login is required.

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Organizing Your Social Sciences Research Paper

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Background information identifies and describes the history and nature of a well-defined research problem with reference to contextualizing existing literature. The background information should indicate the root of the problem being studied, appropriate context of the problem in relation to theory, research, and/or practice , its scope, and the extent to which previous studies have successfully investigated the problem, noting, in particular, where gaps exist that your study attempts to address. Background information does not replace the literature review section of a research paper; it is intended to place the research problem within a specific context and an established plan for its solution.

Fitterling, Lori. Researching and Writing an Effective Background Section of a Research Paper. Kansas City University of Medicine & Biosciences; Creating a Research Paper: How to Write the Background to a Study. DurousseauElectricalInstitute.com; Background Information: Definition of Background Information. Literary Devices Definition and Examples of Literary Terms.

Importance of Having Enough Background Information

Background information expands upon the key points stated in the beginning of your introduction but is not intended to be the main focus of the paper. It generally supports the question, what is the most important information the reader needs to understand before continuing to read the paper? Sufficient background information helps the reader determine if you have a basic understanding of the research problem being investigated and promotes confidence in the overall quality of your analysis and findings. This information provides the reader with the essential context needed to conceptualize the research problem and its significance before moving on to a more thorough analysis of prior research.

Forms of contextualization included in background information can include describing one or more of the following:

• Cultural -- placed within the learned behavior of a specific group or groups of people.
• Economic -- of or relating to systems of production and management of material wealth and/or business activities.
• Gender -- located within the behavioral, cultural, or psychological traits typically associated with being self-identified as male, female, or other form of  gender expression.
• Historical -- the time in which something takes place or was created and how the condition of time influences how you interpret it.
• Interdisciplinary -- explanation of theories, concepts, ideas, or methodologies borrowed from other disciplines applied to the research problem rooted in a discipline other than the discipline where your paper resides.
• Philosophical -- clarification of the essential nature of being or of phenomena as it relates to the research problem.
• Physical/Spatial -- reflects the meaning of space around something and how that influences how it is understood.
• Political -- concerns the environment in which something is produced indicating it's public purpose or agenda.
• Social -- the environment of people that surrounds something's creation or intended audience, reflecting how the people associated with something use and interpret it.
• Temporal -- reflects issues or events of, relating to, or limited by time. Concerns past, present, or future contextualization and not just a historical past.

Background information can also include summaries of important research studies . This can be a particularly important element of providing background information if an innovative or groundbreaking study about the research problem laid a foundation for further research or there was a key study that is essential to understanding your arguments. The priority is to summarize for the reader what is known about the research problem before you conduct the analysis of prior research. This is accomplished with a general summary of the foundational research literature [with citations] that document findings that inform your study's overall aims and objectives.

NOTE : Research studies cited as part of the background information of your introduction should not include very specific, lengthy explanations. This should be discussed in greater detail in your literature review section. If you find a study requiring lengthy explanation, consider moving it to the literature review section.

ANOTHER NOTE : In some cases, your paper's introduction only needs to introduce the research problem, explain its significance, and then describe a road map for how you are going to address the problem; the background information basically forms the introduction part of your literature review. That said, while providing background information is not required, including it in the introduction is a way to highlight important contextual information that could otherwise be hidden or overlooked by the reader if placed in the literature review section.

Background of the Problem Section: What do you Need to Consider? Anonymous. Harvard University; Hopkins, Will G. How to Write a Research Paper. SPORTSCIENCE, Perspectives/Research Resources. Department of Physiology and School of Physical Education, University of Otago, 1999; Green, L. H. How to Write the Background/Introduction Section. Physics 499 Powerpoint slides. University of Illinois; Pyrczak, Fred. Writing Empirical Research Reports: A Basic Guide for Students of the Social and Behavioral Sciences . 8th edition. Glendale, CA: Pyrczak Publishing, 2014; Stevens, Kathleen C. “Can We Improve Reading by Teaching Background Information?.” Journal of Reading 25 (January 1982): 326-329; Woodall, W. Gill. Writing the Background and Significance Section. Senior Research Scientist and Professor of Communication. Center on Alcoholism, Substance Abuse, and Addictions. University of New Mexico.

Structure and Writing Style

Providing background information in the introduction of a research paper serves as a bridge that links the reader to the research problem . Precisely how long and in-depth this bridge should be is largely dependent upon how much information you think the reader will need to know in order to fully understand the problem being discussed and to appreciate why the issues you are investigating are important.

From another perspective, the length and detail of background information also depends on the degree to which you need to demonstrate to your professor how much you understand the research problem. Keep this in mind because providing pertinent background information can be an effective way to demonstrate that you have a clear grasp of key issues, debates, and concepts related to your overall study.

The structure and writing style of your background information can vary depending upon the complexity of your research and/or the nature of the assignment. However, in most cases it should be limited to only one to two paragraphs in your introduction.

Given this, here are some questions to consider while writing this part of your introduction :

• Are there concepts, terms, theories, or ideas that may be unfamiliar to the reader and, thus, require additional explanation?
• Are there historical elements that need to be explored in order to provide needed context, to highlight specific people, issues, or events, or to lay a foundation for understanding the emergence of a current issue or event?
• Are there theories, concepts, or ideas borrowed from other disciplines or academic traditions that may be unfamiliar to the reader and therefore require further explanation?
• Is there a key study or small set of studies that set the stage for understanding the topic and frames why it is important to conduct further research on the topic?
• Y our study uses a method of analysis never applied before;
• Your study investigates a very esoteric or complex research problem;
• Your study introduces new or unique variables that need to be taken into account ; or,
• Your study relies upon analyzing unique texts or documents, such as, archival materials or primary documents like diaries or personal letters that do not represent the established body of source literature on the topic?

Almost all introductions to a research problem require some contextualizing, but the scope and breadth of background information varies depending on your assumption about the reader's level of prior knowledge . However, despite this assessment, background information should be brief and succinct and sets the stage for the elaboration of critical points or in-depth discussion of key issues in the literature review section of your paper.

Writing Tip

Background Information vs. the Literature Review

Incorporating background information into the introduction is intended to provide the reader with critical information about the topic being studied, such as, highlighting and expanding upon foundational studies conducted in the past, describing important historical events that inform why and in what ways the research problem exists, defining key components of your study [concepts, people, places, phenomena] and/or placing the research problem within a particular context. Although introductory background information can often blend into the literature review portion of the paper, essential background information should not be considered a substitute for a comprehensive review and synthesis of relevant research literature.

Hart, Cris. Doing a Literature Review: Releasing the Social Science Research Imagination . Thousand Oaks, CA: Sage, 1998; Pyrczak, Fred. Writing Empirical Research Reports: A Basic Guide for Students of the Social and Behavioral Sciences . 8th edition. Glendale, CA: Pyrczak Publishing, 2014.

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• Korean J Anesthesiol
• v.71(2); 2018 Apr

Introduction to systematic review and meta-analysis

1 Department of Anesthesiology and Pain Medicine, Inje University Seoul Paik Hospital, Seoul, Korea

2 Department of Anesthesiology and Pain Medicine, Chung-Ang University College of Medicine, Seoul, Korea

Systematic reviews and meta-analyses present results by combining and analyzing data from different studies conducted on similar research topics. In recent years, systematic reviews and meta-analyses have been actively performed in various fields including anesthesiology. These research methods are powerful tools that can overcome the difficulties in performing large-scale randomized controlled trials. However, the inclusion of studies with any biases or improperly assessed quality of evidence in systematic reviews and meta-analyses could yield misleading results. Therefore, various guidelines have been suggested for conducting systematic reviews and meta-analyses to help standardize them and improve their quality. Nonetheless, accepting the conclusions of many studies without understanding the meta-analysis can be dangerous. Therefore, this article provides an easy introduction to clinicians on performing and understanding meta-analyses.

Introduction

A systematic review collects all possible studies related to a given topic and design, and reviews and analyzes their results [ 1 ]. During the systematic review process, the quality of studies is evaluated, and a statistical meta-analysis of the study results is conducted on the basis of their quality. A meta-analysis is a valid, objective, and scientific method of analyzing and combining different results. Usually, in order to obtain more reliable results, a meta-analysis is mainly conducted on randomized controlled trials (RCTs), which have a high level of evidence [ 2 ] ( Fig. 1 ). Since 1999, various papers have presented guidelines for reporting meta-analyses of RCTs. Following the Quality of Reporting of Meta-analyses (QUORUM) statement [ 3 ], and the appearance of registers such as Cochrane Library’s Methodology Register, a large number of systematic literature reviews have been registered. In 2009, the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement [ 4 ] was published, and it greatly helped standardize and improve the quality of systematic reviews and meta-analyses [ 5 ].

Levels of evidence.

In anesthesiology, the importance of systematic reviews and meta-analyses has been highlighted, and they provide diagnostic and therapeutic value to various areas, including not only perioperative management but also intensive care and outpatient anesthesia [6–13]. Systematic reviews and meta-analyses include various topics, such as comparing various treatments of postoperative nausea and vomiting [ 14 , 15 ], comparing general anesthesia and regional anesthesia [ 16 – 18 ], comparing airway maintenance devices [ 8 , 19 ], comparing various methods of postoperative pain control (e.g., patient-controlled analgesia pumps, nerve block, or analgesics) [ 20 – 23 ], comparing the precision of various monitoring instruments [ 7 ], and meta-analysis of dose-response in various drugs [ 12 ].

Thus, literature reviews and meta-analyses are being conducted in diverse medical fields, and the aim of highlighting their importance is to help better extract accurate, good quality data from the flood of data being produced. However, a lack of understanding about systematic reviews and meta-analyses can lead to incorrect outcomes being derived from the review and analysis processes. If readers indiscriminately accept the results of the many meta-analyses that are published, incorrect data may be obtained. Therefore, in this review, we aim to describe the contents and methods used in systematic reviews and meta-analyses in a way that is easy to understand for future authors and readers of systematic review and meta-analysis.

Study Planning

It is easy to confuse systematic reviews and meta-analyses. A systematic review is an objective, reproducible method to find answers to a certain research question, by collecting all available studies related to that question and reviewing and analyzing their results. A meta-analysis differs from a systematic review in that it uses statistical methods on estimates from two or more different studies to form a pooled estimate [ 1 ]. Following a systematic review, if it is not possible to form a pooled estimate, it can be published as is without progressing to a meta-analysis; however, if it is possible to form a pooled estimate from the extracted data, a meta-analysis can be attempted. Systematic reviews and meta-analyses usually proceed according to the flowchart presented in Fig. 2 . We explain each of the stages below.

Flowchart illustrating a systematic review.

Formulating research questions

A systematic review attempts to gather all available empirical research by using clearly defined, systematic methods to obtain answers to a specific question. A meta-analysis is the statistical process of analyzing and combining results from several similar studies. Here, the definition of the word “similar” is not made clear, but when selecting a topic for the meta-analysis, it is essential to ensure that the different studies present data that can be combined. If the studies contain data on the same topic that can be combined, a meta-analysis can even be performed using data from only two studies. However, study selection via a systematic review is a precondition for performing a meta-analysis, and it is important to clearly define the Population, Intervention, Comparison, Outcomes (PICO) parameters that are central to evidence-based research. In addition, selection of the research topic is based on logical evidence, and it is important to select a topic that is familiar to readers without clearly confirmed the evidence [ 24 ].

Protocols and registration

In systematic reviews, prior registration of a detailed research plan is very important. In order to make the research process transparent, primary/secondary outcomes and methods are set in advance, and in the event of changes to the method, other researchers and readers are informed when, how, and why. Many studies are registered with an organization like PROSPERO ( http://www.crd.york.ac.uk/PROSPERO/ ), and the registration number is recorded when reporting the study, in order to share the protocol at the time of planning.

Defining inclusion and exclusion criteria

Information is included on the study design, patient characteristics, publication status (published or unpublished), language used, and research period. If there is a discrepancy between the number of patients included in the study and the number of patients included in the analysis, this needs to be clearly explained while describing the patient characteristics, to avoid confusing the reader.

Literature search and study selection

In order to secure proper basis for evidence-based research, it is essential to perform a broad search that includes as many studies as possible that meet the inclusion and exclusion criteria. Typically, the three bibliographic databases Medline, Embase, and Cochrane Central Register of Controlled Trials (CENTRAL) are used. In domestic studies, the Korean databases KoreaMed, KMBASE, and RISS4U may be included. Effort is required to identify not only published studies but also abstracts, ongoing studies, and studies awaiting publication. Among the studies retrieved in the search, the researchers remove duplicate studies, select studies that meet the inclusion/exclusion criteria based on the abstracts, and then make the final selection of studies based on their full text. In order to maintain transparency and objectivity throughout this process, study selection is conducted independently by at least two investigators. When there is a inconsistency in opinions, intervention is required via debate or by a third reviewer. The methods for this process also need to be planned in advance. It is essential to ensure the reproducibility of the literature selection process [ 25 ].

Quality of evidence

However, well planned the systematic review or meta-analysis is, if the quality of evidence in the studies is low, the quality of the meta-analysis decreases and incorrect results can be obtained [ 26 ]. Even when using randomized studies with a high quality of evidence, evaluating the quality of evidence precisely helps determine the strength of recommendations in the meta-analysis. One method of evaluating the quality of evidence in non-randomized studies is the Newcastle-Ottawa Scale, provided by the Ottawa Hospital Research Institute 1) . However, we are mostly focusing on meta-analyses that use randomized studies.

If the Grading of Recommendations, Assessment, Development and Evaluations (GRADE) system ( http://www.gradeworkinggroup.org/ ) is used, the quality of evidence is evaluated on the basis of the study limitations, inaccuracies, incompleteness of outcome data, indirectness of evidence, and risk of publication bias, and this is used to determine the strength of recommendations [ 27 ]. As shown in Table 1 , the study limitations are evaluated using the “risk of bias” method proposed by Cochrane 2) . This method classifies bias in randomized studies as “low,” “high,” or “unclear” on the basis of the presence or absence of six processes (random sequence generation, allocation concealment, blinding participants or investigators, incomplete outcome data, selective reporting, and other biases) [ 28 ].

The Cochrane Collaboration’s Tool for Assessing the Risk of Bias [ 28 ]

Data extraction

Two different investigators extract data based on the objectives and form of the study; thereafter, the extracted data are reviewed. Since the size and format of each variable are different, the size and format of the outcomes are also different, and slight changes may be required when combining the data [ 29 ]. If there are differences in the size and format of the outcome variables that cause difficulties combining the data, such as the use of different evaluation instruments or different evaluation timepoints, the analysis may be limited to a systematic review. The investigators resolve differences of opinion by debate, and if they fail to reach a consensus, a third-reviewer is consulted.

Data Analysis

The aim of a meta-analysis is to derive a conclusion with increased power and accuracy than what could not be able to achieve in individual studies. Therefore, before analysis, it is crucial to evaluate the direction of effect, size of effect, homogeneity of effects among studies, and strength of evidence [ 30 ]. Thereafter, the data are reviewed qualitatively and quantitatively. If it is determined that the different research outcomes cannot be combined, all the results and characteristics of the individual studies are displayed in a table or in a descriptive form; this is referred to as a qualitative review. A meta-analysis is a quantitative review, in which the clinical effectiveness is evaluated by calculating the weighted pooled estimate for the interventions in at least two separate studies.

The pooled estimate is the outcome of the meta-analysis, and is typically explained using a forest plot ( Figs. 3 and ​ and4). 4 ). The black squares in the forest plot are the odds ratios (ORs) and 95% confidence intervals in each study. The area of the squares represents the weight reflected in the meta-analysis. The black diamond represents the OR and 95% confidence interval calculated across all the included studies. The bold vertical line represents a lack of therapeutic effect (OR = 1); if the confidence interval includes OR = 1, it means no significant difference was found between the treatment and control groups.

Forest plot analyzed by two different models using the same data. (A) Fixed-effect model. (B) Random-effect model. The figure depicts individual trials as filled squares with the relative sample size and the solid line as the 95% confidence interval of the difference. The diamond shape indicates the pooled estimate and uncertainty for the combined effect. The vertical line indicates the treatment group shows no effect (OR = 1). Moreover, if the confidence interval includes 1, then the result shows no evidence of difference between the treatment and control groups.

Forest plot representing homogeneous data.

Dichotomous variables and continuous variables

In data analysis, outcome variables can be considered broadly in terms of dichotomous variables and continuous variables. When combining data from continuous variables, the mean difference (MD) and standardized mean difference (SMD) are used ( Table 2 ).

Summary of Meta-analysis Methods Available in RevMan [ 28 ]

The MD is the absolute difference in mean values between the groups, and the SMD is the mean difference between groups divided by the standard deviation. When results are presented in the same units, the MD can be used, but when results are presented in different units, the SMD should be used. When the MD is used, the combined units must be shown. A value of “0” for the MD or SMD indicates that the effects of the new treatment method and the existing treatment method are the same. A value lower than “0” means the new treatment method is less effective than the existing method, and a value greater than “0” means the new treatment is more effective than the existing method.

When combining data for dichotomous variables, the OR, risk ratio (RR), or risk difference (RD) can be used. The RR and RD can be used for RCTs, quasi-experimental studies, or cohort studies, and the OR can be used for other case-control studies or cross-sectional studies. However, because the OR is difficult to interpret, using the RR and RD, if possible, is recommended. If the outcome variable is a dichotomous variable, it can be presented as the number needed to treat (NNT), which is the minimum number of patients who need to be treated in the intervention group, compared to the control group, for a given event to occur in at least one patient. Based on Table 3 , in an RCT, if x is the probability of the event occurring in the control group and y is the probability of the event occurring in the intervention group, then x = c/(c + d), y = a/(a + b), and the absolute risk reduction (ARR) = x − y. NNT can be obtained as the reciprocal, 1/ARR.

Calculation of the Number Needed to Treat in the Dichotomous table

Fixed-effect models and random-effect models

In order to analyze effect size, two types of models can be used: a fixed-effect model or a random-effect model. A fixed-effect model assumes that the effect of treatment is the same, and that variation between results in different studies is due to random error. Thus, a fixed-effect model can be used when the studies are considered to have the same design and methodology, or when the variability in results within a study is small, and the variance is thought to be due to random error. Three common methods are used for weighted estimation in a fixed-effect model: 1) inverse variance-weighted estimation 3) , 2) Mantel-Haenszel estimation 4) , and 3) Peto estimation 5) .

A random-effect model assumes heterogeneity between the studies being combined, and these models are used when the studies are assumed different, even if a heterogeneity test does not show a significant result. Unlike a fixed-effect model, a random-effect model assumes that the size of the effect of treatment differs among studies. Thus, differences in variation among studies are thought to be due to not only random error but also between-study variability in results. Therefore, weight does not decrease greatly for studies with a small number of patients. Among methods for weighted estimation in a random-effect model, the DerSimonian and Laird method 6) is mostly used for dichotomous variables, as the simplest method, while inverse variance-weighted estimation is used for continuous variables, as with fixed-effect models. These four methods are all used in Review Manager software (The Cochrane Collaboration, UK), and are described in a study by Deeks et al. [ 31 ] ( Table 2 ). However, when the number of studies included in the analysis is less than 10, the Hartung-Knapp-Sidik-Jonkman method 7) can better reduce the risk of type 1 error than does the DerSimonian and Laird method [ 32 ].

Fig. 3 shows the results of analyzing outcome data using a fixed-effect model (A) and a random-effect model (B). As shown in Fig. 3 , while the results from large studies are weighted more heavily in the fixed-effect model, studies are given relatively similar weights irrespective of study size in the random-effect model. Although identical data were being analyzed, as shown in Fig. 3 , the significant result in the fixed-effect model was no longer significant in the random-effect model. One representative example of the small study effect in a random-effect model is the meta-analysis by Li et al. [ 33 ]. In a large-scale study, intravenous injection of magnesium was unrelated to acute myocardial infarction, but in the random-effect model, which included numerous small studies, the small study effect resulted in an association being found between intravenous injection of magnesium and myocardial infarction. This small study effect can be controlled for by using a sensitivity analysis, which is performed to examine the contribution of each of the included studies to the final meta-analysis result. In particular, when heterogeneity is suspected in the study methods or results, by changing certain data or analytical methods, this method makes it possible to verify whether the changes affect the robustness of the results, and to examine the causes of such effects [ 34 ].

Heterogeneity

Homogeneity test is a method whether the degree of heterogeneity is greater than would be expected to occur naturally when the effect size calculated from several studies is higher than the sampling error. This makes it possible to test whether the effect size calculated from several studies is the same. Three types of homogeneity tests can be used: 1) forest plot, 2) Cochrane’s Q test (chi-squared), and 3) Higgins I 2 statistics. In the forest plot, as shown in Fig. 4 , greater overlap between the confidence intervals indicates greater homogeneity. For the Q statistic, when the P value of the chi-squared test, calculated from the forest plot in Fig. 4 , is less than 0.1, it is considered to show statistical heterogeneity and a random-effect can be used. Finally, I 2 can be used [ 35 ].

I 2 , calculated as shown above, returns a value between 0 and 100%. A value less than 25% is considered to show strong homogeneity, a value of 50% is average, and a value greater than 75% indicates strong heterogeneity.

Even when the data cannot be shown to be homogeneous, a fixed-effect model can be used, ignoring the heterogeneity, and all the study results can be presented individually, without combining them. However, in many cases, a random-effect model is applied, as described above, and a subgroup analysis or meta-regression analysis is performed to explain the heterogeneity. In a subgroup analysis, the data are divided into subgroups that are expected to be homogeneous, and these subgroups are analyzed. This needs to be planned in the predetermined protocol before starting the meta-analysis. A meta-regression analysis is similar to a normal regression analysis, except that the heterogeneity between studies is modeled. This process involves performing a regression analysis of the pooled estimate for covariance at the study level, and so it is usually not considered when the number of studies is less than 10. Here, univariate and multivariate regression analyses can both be considered.

Publication bias

Publication bias is the most common type of reporting bias in meta-analyses. This refers to the distortion of meta-analysis outcomes due to the higher likelihood of publication of statistically significant studies rather than non-significant studies. In order to test the presence or absence of publication bias, first, a funnel plot can be used ( Fig. 5 ). Studies are plotted on a scatter plot with effect size on the x-axis and precision or total sample size on the y-axis. If the points form an upside-down funnel shape, with a broad base that narrows towards the top of the plot, this indicates the absence of a publication bias ( Fig. 5A ) [ 29 , 36 ]. On the other hand, if the plot shows an asymmetric shape, with no points on one side of the graph, then publication bias can be suspected ( Fig. 5B ). Second, to test publication bias statistically, Begg and Mazumdar’s rank correlation test 8) [ 37 ] or Egger’s test 9) [ 29 ] can be used. If publication bias is detected, the trim-and-fill method 10) can be used to correct the bias [ 38 ]. Fig. 6 displays results that show publication bias in Egger’s test, which has then been corrected using the trim-and-fill method using Comprehensive Meta-Analysis software (Biostat, USA).

Funnel plot showing the effect size on the x-axis and sample size on the y-axis as a scatter plot. (A) Funnel plot without publication bias. The individual plots are broader at the bottom and narrower at the top. (B) Funnel plot with publication bias. The individual plots are located asymmetrically.

Funnel plot adjusted using the trim-and-fill method. White circles: comparisons included. Black circles: inputted comparisons using the trim-and-fill method. White diamond: pooled observed log risk ratio. Black diamond: pooled inputted log risk ratio.

Result Presentation

When reporting the results of a systematic review or meta-analysis, the analytical content and methods should be described in detail. First, a flowchart is displayed with the literature search and selection process according to the inclusion/exclusion criteria. Second, a table is shown with the characteristics of the included studies. A table should also be included with information related to the quality of evidence, such as GRADE ( Table 4 ). Third, the results of data analysis are shown in a forest plot and funnel plot. Fourth, if the results use dichotomous data, the NNT values can be reported, as described above.

The GRADE Evidence Quality for Each Outcome

N: number of studies, ROB: risk of bias, PON: postoperative nausea, POV: postoperative vomiting, PONV: postoperative nausea and vomiting, CI: confidence interval, RR: risk ratio, AR: absolute risk.

When Review Manager software (The Cochrane Collaboration, UK) is used for the analysis, two types of P values are given. The first is the P value from the z-test, which tests the null hypothesis that the intervention has no effect. The second P value is from the chi-squared test, which tests the null hypothesis for a lack of heterogeneity. The statistical result for the intervention effect, which is generally considered the most important result in meta-analyses, is the z-test P value.

A common mistake when reporting results is, given a z-test P value greater than 0.05, to say there was “no statistical significance” or “no difference.” When evaluating statistical significance in a meta-analysis, a P value lower than 0.05 can be explained as “a significant difference in the effects of the two treatment methods.” However, the P value may appear non-significant whether or not there is a difference between the two treatment methods. In such a situation, it is better to announce “there was no strong evidence for an effect,” and to present the P value and confidence intervals. Another common mistake is to think that a smaller P value is indicative of a more significant effect. In meta-analyses of large-scale studies, the P value is more greatly affected by the number of studies and patients included, rather than by the significance of the results; therefore, care should be taken when interpreting the results of a meta-analysis.

When performing a systematic literature review or meta-analysis, if the quality of studies is not properly evaluated or if proper methodology is not strictly applied, the results can be biased and the outcomes can be incorrect. However, when systematic reviews and meta-analyses are properly implemented, they can yield powerful results that could usually only be achieved using large-scale RCTs, which are difficult to perform in individual studies. As our understanding of evidence-based medicine increases and its importance is better appreciated, the number of systematic reviews and meta-analyses will keep increasing. However, indiscriminate acceptance of the results of all these meta-analyses can be dangerous, and hence, we recommend that their results be received critically on the basis of a more accurate understanding.

1) http://www.ohri.ca .

2) http://methods.cochrane.org/bias/assessing-risk-bias-included-studies .

3) The inverse variance-weighted estimation method is useful if the number of studies is small with large sample sizes.

4) The Mantel-Haenszel estimation method is useful if the number of studies is large with small sample sizes.

5) The Peto estimation method is useful if the event rate is low or one of the two groups shows zero incidence.

6) The most popular and simplest statistical method used in Review Manager and Comprehensive Meta-analysis software.

7) Alternative random-effect model meta-analysis that has more adequate error rates than does the common DerSimonian and Laird method, especially when the number of studies is small. However, even with the Hartung-Knapp-Sidik-Jonkman method, when there are less than five studies with very unequal sizes, extra caution is needed.

8) The Begg and Mazumdar rank correlation test uses the correlation between the ranks of effect sizes and the ranks of their variances [ 37 ].

9) The degree of funnel plot asymmetry as measured by the intercept from the regression of standard normal deviates against precision [ 29 ].

10) If there are more small studies on one side, we expect the suppression of studies on the other side. Trimming yields the adjusted effect size and reduces the variance of the effects by adding the original studies back into the analysis as a mirror image of each study.

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How Pew Research Center will report on generations moving forward

Journalists, researchers and the public often look at society through the lens of generation, using terms like Millennial or Gen Z to describe groups of similarly aged people. This approach can help readers see themselves in the data and assess where we are and where we’re headed as a country.

Pew Research Center has been at the forefront of generational research over the years, telling the story of Millennials as they came of age politically and as they moved more firmly into adult life . In recent years, we’ve also been eager to learn about Gen Z as the leading edge of this generation moves into adulthood.

But generational research has become a crowded arena. The field has been flooded with content that’s often sold as research but is more like clickbait or marketing mythology. There’s also been a growing chorus of criticism about generational research and generational labels in particular.

Recently, as we were preparing to embark on a major research project related to Gen Z, we decided to take a step back and consider how we can study generations in a way that aligns with our values of accuracy, rigor and providing a foundation of facts that enriches the public dialogue.

A typical generation spans 15 to 18 years. As many critics of generational research point out, there is great diversity of thought, experience and behavior within generations.

We set out on a yearlong process of assessing the landscape of generational research. We spoke with experts from outside Pew Research Center, including those who have been publicly critical of our generational analysis, to get their take on the pros and cons of this type of work. We invested in methodological testing to determine whether we could compare findings from our earlier telephone surveys to the online ones we’re conducting now. And we experimented with higher-level statistical analyses that would allow us to isolate the effect of generation.

What emerged from this process was a set of clear guidelines that will help frame our approach going forward. Many of these are principles we’ve always adhered to , but others will require us to change the way we’ve been doing things in recent years.

Here’s a short overview of how we’ll approach generational research in the future:

We’ll only do generational analysis when we have historical data that allows us to compare generations at similar stages of life. When comparing generations, it’s crucial to control for age. In other words, researchers need to look at each generation or age cohort at a similar point in the life cycle. (“Age cohort” is a fancy way of referring to a group of people who were born around the same time.)

When doing this kind of research, the question isn’t whether young adults today are different from middle-aged or older adults today. The question is whether young adults today are different from young adults at some specific point in the past.

To answer this question, it’s necessary to have data that’s been collected over a considerable amount of time – think decades. Standard surveys don’t allow for this type of analysis. We can look at differences across age groups, but we can’t compare age groups over time.

Another complication is that the surveys we conducted 20 or 30 years ago aren’t usually comparable enough to the surveys we’re doing today. Our earlier surveys were done over the phone, and we’ve since transitioned to our nationally representative online survey panel , the American Trends Panel . Our internal testing showed that on many topics, respondents answer questions differently depending on the way they’re being interviewed. So we can’t use most of our surveys from the late 1980s and early 2000s to compare Gen Z with Millennials and Gen Xers at a similar stage of life.

This means that most generational analysis we do will use datasets that have employed similar methodologies over a long period of time, such as surveys from the U.S. Census Bureau. A good example is our 2020 report on Millennial families , which used census data going back to the late 1960s. The report showed that Millennials are marrying and forming families at a much different pace than the generations that came before them.

Even when we have historical data, we will attempt to control for other factors beyond age in making generational comparisons. If we accept that there are real differences across generations, we’re basically saying that people who were born around the same time share certain attitudes or beliefs – and that their views have been influenced by external forces that uniquely shaped them during their formative years. Those forces may have been social changes, economic circumstances, technological advances or political movements.

When we see that younger adults have different views than their older counterparts, it may be driven by their demographic traits rather than the fact that they belong to a particular generation.

The tricky part is isolating those forces from events or circumstances that have affected all age groups, not just one generation. These are often called “period effects.” An example of a period effect is the Watergate scandal, which drove down trust in government among all age groups. Differences in trust across age groups in the wake of Watergate shouldn’t be attributed to the outsize impact that event had on one age group or another, because the change occurred across the board.

Changing demographics also may play a role in patterns that might at first seem like generational differences. We know that the United States has become more racially and ethnically diverse in recent decades, and that race and ethnicity are linked with certain key social and political views. When we see that younger adults have different views than their older counterparts, it may be driven by their demographic traits rather than the fact that they belong to a particular generation.

Controlling for these factors can involve complicated statistical analysis that helps determine whether the differences we see across age groups are indeed due to generation or not. This additional step adds rigor to the process. Unfortunately, it’s often absent from current discussions about Gen Z, Millennials and other generations.

When we can’t do generational analysis, we still see value in looking at differences by age and will do so where it makes sense. Age is one of the most common predictors of differences in attitudes and behaviors. And even if age gaps aren’t rooted in generational differences, they can still be illuminating. They help us understand how people across the age spectrum are responding to key trends, technological breakthroughs and historical events.

Each stage of life comes with a unique set of experiences. Young adults are often at the leading edge of changing attitudes on emerging social trends. Take views on same-sex marriage , for example, or attitudes about gender identity .

Many middle-aged adults, in turn, face the challenge of raising children while also providing care and support to their aging parents. And older adults have their own obstacles and opportunities. All of these stories – rooted in the life cycle, not in generations – are important and compelling, and we can tell them by analyzing our surveys at any given point in time.

When we do have the data to study groups of similarly aged people over time, we won’t always default to using the standard generational definitions and labels. While generational labels are simple and catchy, there are other ways to analyze age cohorts. For example, some observers have suggested grouping people by the decade in which they were born. This would create narrower cohorts in which the members may share more in common. People could also be grouped relative to their age during key historical events (such as the Great Recession or the COVID-19 pandemic) or technological innovations (like the invention of the iPhone).

By choosing not to use the standard generational labels when they’re not appropriate, we can avoid reinforcing harmful stereotypes or oversimplifying people’s complex lived experiences.

Existing generational definitions also may be too broad and arbitrary to capture differences that exist among narrower cohorts. A typical generation spans 15 to 18 years. As many critics of generational research point out, there is great diversity of thought, experience and behavior within generations. The key is to pick a lens that’s most appropriate for the research question that’s being studied. If we’re looking at political views and how they’ve shifted over time, for example, we might group people together according to the first presidential election in which they were eligible to vote.

With these considerations in mind, our audiences should not expect to see a lot of new research coming out of Pew Research Center that uses the generational lens. We’ll only talk about generations when it adds value, advances important national debates and highlights meaningful societal trends.

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Kim Parker is director of social trends research at Pew Research Center

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