27/08/2025
📑 How to Write a Systematic Review or Meta-Analysis – Step-by-Step Guidance
Systematic reviews and meta-analyses are powerful tools to summarize evidence and guide healthcare or public health decisions. Here’s a clear step-by-step approach for beginners and advanced researchers alike:
1️⃣ Define Your Research Question Clearly
Use frameworks like PICO (Population, Intervention, Comparison, Outcome) for clinical studies.
For public health or observational research, adapt PECO (Population, Exposure, Comparator, Outcome) or SPICE (Setting, Perspective, Intervention, Comparison, Evaluation).
✅ Tip: A focused question guides your search strategy, inclusion criteria, and analysis.
2️⃣ Develop a Protocol
Register your protocol on platforms like PROSPERO to improve transparency.
Include objectives, eligibility criteria, databases to search, and planned analyses.
✅ Tip: A protocol prevents bias and makes your review replicable.
3️⃣ Conduct a Comprehensive Literature Search
Search multiple databases: PubMed, Scopus, Web of Science, Cochrane Library.
Use keywords, MeSH terms, Boolean operators to cover all relevant studies.
✅ Tip: Keep a record of search results for reproducibility.
4️⃣ Screen and Select Studies
Remove duplicates, then screen titles and abstracts based on inclusion/exclusion criteria.
Read full texts for eligibility.
✅ Tip: Use tools like Rayyan or Covidence to streamline screening.
5️⃣ Extract Data Systematically
Create a data extraction sheet with study details, sample size, outcomes, effect sizes, and quality scores.
✅ Tip: Have two reviewers extract data independently to reduce errors.
6️⃣ Assess Study Quality
Use tools like Cochrane Risk of Bias, Newcastle-Ottawa Scale, or AMSTAR checklist.
✅ Tip: Quality assessment helps interpret results and confidence in your conclusions.
7️⃣ Analyze and Synthesize Results
For meta-analyses, calculate pooled effect sizes, heterogeneity, and perform subgroup or sensitivity analyses.
For narrative synthesis, summarize patterns, gaps, and implications.
8️⃣ Write Your Review Clearly
Include introduction, methods, results, discussion, limitations, and conclusion.
✅ Tip: Use PRISMA guidelines for transparent reporting.
💬 Question: Have you ever attempted a systematic review or meta-analysis? What part do you find most challenging: literature search, data extraction, or analysis? Comment below!