The systematic review guide
Clear, practical answers to the questions that come up at every stage of a systematic review and meta-analysis, from framing the question and registering a protocol to searching, screening, extracting, appraising, and synthesising the evidence.
July 27, 2026 · 7 minPICOT Questions: What the Time Element Adds and How Each Part Becomes a SearchThe fifth element in PICOT does two different jobs, and only some of the five ever become search blocks. Here is which, and why.Read article
July 21, 2026 · 8 minEvidence-Based Practice Models: How the Framework You Choose Changes Your Search and AppraisalMost guides profile the models one by one. The useful question is what each one commits you to before you run a single search.Read article July 17, 2026 · 8 minIPD Meta-Analysis: The Gold Standard ExplainedHow an individual patient data meta-analysis re-analyses raw trial records to standardise analyses, test patient-level effect modifiers, and check randomisation integrity.Read article July 16, 2026 · 8 minLiving Systematic Reviews: Evidence That Stays CurrentHow a living systematic review uses continual search surveillance, pre-specified update triggers, and machine-assisted screening to keep a synthesis current, and what it honestly costs.Read article July 15, 2026 · 8 minMeta-Synthesis: Combining Qualitative Research FindingsWhat qualitative meta-synthesis is, how meta-ethnography, thematic synthesis, and meta-aggregation differ, and how CASP, GRADE-CERQual, and ENTREQ make the findings credible.Read article July 14, 2026 · 8 minCINAHL Search Strategy: Subject Headings, Syntax, and Why You Cannot Paste a MEDLINE Search AcrossCINAHL uses its own thesaurus with different scope notes and hierarchies. Translating a MEDLINE search across without rebuilding loses records silently.Read article July 13, 2026 · 8 minEvidence Gap Maps: The Matrix View of a Research FieldHow an evidence gap map plots interventions against outcomes to show where research is concentrated and where it is missing, and how funders use the matrix to set priorities.Read article July 10, 2026 · 8 minRealist Review: Explaining How Interventions WorkWhat a realist review is, how context-mechanism-outcome configurations and programme theory drive the method, and when this theory-driven synthesis beats an effectiveness review.Read article July 8, 2026 · 8 minLevels of Evidence in Nursing: Competing Hierarchies and Why the Number Alone Means NothingCalling a study Level III says nothing unless you name the scheme. The hierarchies disagree, and level was never a measure of quality.Read article July 8, 2026 · 8 minRevise and Resubmit: How to Answer Reviewers and WinWhat a revise and resubmit decision really means, how to decode and answer every reviewer comment point by point, and the mistakes that turn an invitation into a rejection.Read article July 6, 2026 · 8 minRapid Review Methods: The Shortcuts That Are SafeHow a rapid review compresses the systematic review process using Cochrane-endorsed shortcuts, what a realistic timeline looks like, and when the method should not be used.Read article July 2, 2026 · 7 minSQUIRE 2.0: Reporting Improvement Work, and the Two Items You Cannot Add LaterImprovement interventions are expected to change as they meet reality. SQUIRE exists because trial reporting formats erase exactly that.Read article July 2, 2026 · 8 minMeta-Analysis in Stata: A Guide to the meta SuiteA practical guide to meta-analysis in Stata: declaring data with meta set and meta esize, pooling with meta summarize, forest and funnel plots, meta regress, and how the suite compares with R.Read article July 1, 2026 · 8 minSynthesis Without Meta-Analysis (SWiM) ExplainedHow synthesis without meta-analysis works, the nine SWiM items, and the structured alternatives to pooling that survive peer review.Read article June 30, 2026 · 8 minMeta-Analysis in R: A Guide to meta and metaforA practical guide to meta-analysis in R: how the meta and metafor packages differ, the metagen and rma workflows, REML and Hartung-Knapp, and the plots and bias tests that complete a synthesis.Read article June 26, 2026 · 8 minGRADEpro: Building Summary of Findings TablesHow GRADEpro GDT turns pooled results into a rated Summary of Findings table, from absolute effects and the eight GRADE domains to footnotes and RevMan import.Read article June 24, 2026 · 8 minPrevalence Meta-Analysis: Pooling ProportionsHow a prevalence meta-analysis pools proportions, why raw proportions misbehave, the transformation debate, and how to handle extreme heterogeneity.Read article June 23, 2026 · 8 minRevMan: A Guide to Cochrane's Review ManagerHow RevMan Web structures a systematic review, the meta-analysis methods it supports, its forest and funnel plots, and where its limits push you toward R or Stata.Read article June 19, 2026 · 8 minCritical Appraisal Tools: Which to Use for Each DesignA design-by-design map of the major critical appraisal tools, the logic for choosing between them, and the duplicate workflow every appraisal should follow.Read article June 17, 2026 · 8 minDose-Response Meta-Analysis: Methods and SoftwareHow a dose-response meta-analysis models the full exposure curve with splines and the Greenland and Longnecker method, and the data problems that derail it.Read article June 16, 2026 · 8 minThe Mixed Methods Appraisal Tool (MMAT) ExplainedHow the MMAT 2018 appraises qualitative, quantitative, and mixed methods studies with one instrument, and why its authors removed the overall numeric score.Read article June 12, 2026 · 8 minQUADAS-2: Appraising Diagnostic Accuracy StudiesHow the QUADAS-2 tool judges diagnostic accuracy studies across four domains, why bias and applicability are scored separately, and where QUADAS-C and QUADAS-AI fit.Read article June 11, 2026 · 8 minThe Trim and Fill Method in Meta-AnalysisHow the trim and fill method imputes mirrored studies to gauge missing evidence, what the L0 and R0 estimators do, and why it fails under heterogeneity.Read article June 9, 2026 · 8 minJBI Critical Appraisal Tools for Every Study DesignHow the Joanna Briggs Institute checklists appraise each study design, what the yes, no, unclear responses feed into, and when to choose JBI over Cochrane tools.Read article June 6, 2026 · 8 minEgger's Test for Funnel Plot Asymmetry ExplainedHow Egger's test detects funnel plot asymmetry by regressing standardised effect on precision, how to read the intercept, and why it flags small-study effects.Read article June 5, 2026 · 8 minCASP Checklists: A Design-by-Design GuideWhat the CASP checklists cover for each study design, how the validity-results-applicability logic works, and when a formal risk of bias tool is expected instead.Read article May 20, 2026 · 10 minBest Citation Manager for ReviewsZotero, Mendeley, and EndNote compared for systematic review work on deduplication, capacity, collaboration, cost, and export, with a clear recommendation by scenario.Read article May 6, 2026 · 9 minMendeley for Systematic ReviewsHow to use Mendeley in a systematic review: organising a library, the Word citation plugin, deduplication, the move from Mendeley Desktop, and how it stacks up against Zotero.Read article April 21, 2026 · 9 minLikelihood Ratios in Diagnostic TestsHow positive and negative likelihood ratios combine sensitivity and specificity, update pre-test to post-test probability, and feature in diagnostic accuracy reviews.Read article April 15, 2026 · 9 minEndNote for Systematic ReviewsHow to use EndNote in a systematic review: groups for each database, strong deduplication and file management, exporting to screening, and the paid versus free versions.Read article April 8, 2026 · 9 minHazard Ratio: How to Interpret ItWhat a hazard ratio means in survival analysis, the Cox model and proportional hazards assumption, why it differs from a risk ratio, and how hazard ratios are pooled.Read article March 28, 2026 · 9 minRayyan for Screening: A GuideHow to screen a systematic review in Rayyan: blinded dual screening, labels and filters, machine-learning relevance ranking, and when teams pick it over Covidence.Read article March 22, 2026 · 9 minAbsolute Risk Reduction ExplainedWhat absolute risk reduction is, how it differs from relative risk reduction, the link to number needed to treat, and why absolute measures matter for pooled effects.Read article March 12, 2026 · 9 minCovidence: A Guide for ReviewersHow Covidence runs systematic review screening and extraction, from dual independent voting and conflict resolution to extraction templates and reporting counts.Read article March 5, 2026 · 9 minWhat Is a Narrative Review?What a narrative review is, how it differs from a systematic review and from narrative synthesis, when to use it, and how to keep it rigorous.Read article February 19, 2026 · 10 minNetwork Meta-Analysis: A Practical GuideHow network meta-analysis combines direct and indirect evidence to compare three or more treatments, the transitivity and consistency assumptions, and SUCRA ranking.Read article February 11, 2026 · 9 minUsing Zotero for Systematic ReviewsHow to use the free Zotero reference manager to gather, organise, deduplicate, and export records before screening, and where it stops being enough.Read article February 3, 2026 · 9 minThe STROBE Statement ExplainedWhat the STROBE statement requires for cohort, case-control, and cross-sectional studies, how to complete and cite the 22-item checklist, and how it relates to ROBINS-I.Read article January 28, 2026 · 9 minWhat Is a Cochrane Review?What a Cochrane review is, how it differs from a generic systematic review through Cochrane methods and editorial process, and why it is so reliable.Read article January 14, 2026 · 9 minThe CONSORT Statement ExplainedWhat the CONSORT statement requires, its 25-item checklist and flow diagram, the CONSORT 2025 update, and how it differs from PRISMA and risk-of-bias tools.Read article December 12, 2025 · 11 minMeta-Analysis Software Compared: R, Stata, RevMan, and MoreA factual comparison of the main meta-analysis tools, from scripted R and Stata to point-and-click RevMan, Comprehensive Meta-Analysis, and JASP.Read article December 4, 2025 · 9 minUmbrella Review: How to Conduct a Review of ReviewsWhat an umbrella review is, when it fits, and how to run one, from searching for reviews through AMSTAR 2 appraisal, overlap, and synthesis.Read article November 25, 2025 · 9 minPRISMA 2020 Reporting Guideline: The Checklist ExplainedWhat the PRISMA 2020 reporting guideline asks for, section by section, plus the flow diagram and the extensions like PRISMA-ScR.Read article November 18, 2025 · 11 minHow to Conduct a Scoping Review: A Step-by-Step GuideThe scoping review method stage by stage: PCC question, protocol, search, duplicate screening, charting, and a PRISMA-ScR report.Read article November 15, 2025 · 9 minNumber Needed to Treat: Calculation and InterpretationAn intuitive absolute measure of benefit: how many patients you treat for one to gain, how to compute it, and why baseline risk changes everything.Read article November 9, 2025 · 10 minNarrative Synthesis vs Meta-Analysis: How to ChooseWhen to pool studies into a single estimate and when a structured narrative is the correct method, decided by how comparable the studies really are.Read article November 3, 2025 · 10 minSensitivity Analysis in Meta-Analysis: Testing RobustnessRe-running a meta-analysis under different defensible choices to see whether the conclusion is robust or hangs on one fragile decision.Read article October 27, 2025 · 10 minSubgroup Analysis and Meta-Regression ExplainedTwo ways to ask why studies disagree: splitting studies into subgroups versus modelling the effect against a moderator, and how to read each safely.Read article October 21, 2025 · 11 minEffect Sizes in Meta-Analysis: Metrics, Conversion, and PoolingWhich effect size metric to choose for binary and continuous outcomes, how to convert between them, and how they feed a pooled estimate.Read article October 20, 2025 · 10 minOdds Ratio vs Risk Ratio: Which to UseWhat separates the odds ratio from the risk ratio, when to use each, why they only agree for rare outcomes, and why consistency matters in a meta-analysis.Read article October 13, 2025 · 10 minFunnel Plot Interpretation: Spotting BiasHow to read a funnel plot for small-study effects and publication bias, what asymmetry does and does not prove, and when a formal test is even feasible.Read article October 6, 2025 · 10 minForest Plot Interpretation: How to Read OneHow to read every element of a forest plot, from study squares and whiskers to the pooled diamond, and the misreadings to avoid.Read article September 29, 2025 · 11 minHeterogeneity in Meta-Analysis: A Clear GuideWhat heterogeneity is, how I-squared, tau-squared, and prediction intervals measure it, and what to do when the variation between studies is high.Read article September 22, 2025 · 10 minFixed-Effect vs Random-Effects Models ExplainedWhat each model assumes, how the choice shifts your pooled estimate and study weights, and how to decide in the protocol rather than after seeing the data.Read article September 16, 2025 · 11 minHow to Do a Meta-Analysis: A Practical GuideFrom choosing a common effect measure to weighting, model choice, and reading the pooled forest plot, the full method for combining study results.Read article September 15, 2025 · 9 minHow to Write a Systematic Review: A Step-by-Step GuideThe full method, stage by stage: protocol, search, screening, extraction, risk of bias, and synthesis, and how to keep the whole project manageable.Read article September 14, 2025 · 10 minPublication Bias in Systematic Reviews and Meta-AnalysisWhy publication bias skews a meta-analysis, how funnel plots and asymmetry tests detect it, and why a wide search and a registered protocol are the best defence.Read article September 11, 2025 · 9 minAMSTAR 2 Critical Appraisal of Systematic ReviewsHow AMSTAR 2 appraises a systematic review across sixteen items, why the critical domains drive the confidence rating, and the requirements that catch authors out.Read article September 7, 2025 · 8 minRisk of Bias vs Quality Assessment: The DifferenceWhy risk of bias and quality assessment ask different questions, how summed quality scores can hide a fatal flaw, and why the field moved to domain judgements.Read article September 1, 2025 · 9 minGRADE Certainty of Evidence ExplainedHow GRADE rates the certainty of evidence per outcome across four levels, the five reasons to downgrade, and how it differs from per-study risk of bias.Read article August 25, 2025 · 8 minThe Newcastle-Ottawa Scale for Observational StudiesHow the Newcastle-Ottawa Scale appraises observational studies with stars across selection, comparability, and outcome, and why per-domain reporting matters.Read article August 19, 2025 · 9 minThe ROBINS-I Tool for Non-Randomised StudiesHow the ROBINS-I tool uses a target trial to judge non-randomised studies across seven domains, and why pre-specifying confounders is essential.Read article August 12, 2025 · 9 minThe RoB 2 Tool for Randomised Trials ExplainedHow the RoB 2 tool judges randomised trials across five domains, why the signalling questions matter, and how overall risk of bias is decided per outcome.Read article August 4, 2025 · 9 minRisk of Bias Assessment in Systematic ReviewsWhat a risk of bias assessment is, how to match the tool to the study design, and how per-outcome judgements feed into the certainty of evidence.Read article July 29, 2025 · 10 minCoding Data in Qualitative Reviews: A Practical GuideHow to label, group, and build the findings of primary studies into themes, with a coding frame, dual coding, and a clear audit trail.Read article July 25, 2025 · 9 minContacting Authors for Missing Data in a ReviewWhen to email study authors, how to write a request that gets answered, and how to plan for the data that never arrives.Read article July 20, 2025 · 9 minExtracting Data from Figures in a Systematic ReviewHow to recover means, proportions, and intervals from charts when the numbers are not in the text, using a calibrated digitising tool.Read article July 14, 2025 · 9 minPiloting a Data Extraction Form: A Step-by-Step GuideHow a small pilot run exposes ambiguous fields and reviewer drift before they contaminate the full extraction, and how to act on what it finds.Read article July 9, 2025 · 9 minData Extraction Form Template: How to Build One That WorksThe sections, field types, and codebook rules that turn an extraction form template into a reliable instrument for clean, consistent data.Read article July 3, 2025 · 10 minData Extraction in a Systematic Review: A Practical GuideThe fields to capture, how to extract in duplicate, and how a piloted form turns full-text papers into a clean, analysable dataset.Read article June 30, 2025 · 9 minInter-Rater Reliability in ScreeningWhy two reviewers report Cohen’s kappa, how to read the value, the kappa paradox, and what reliability does and does not prove.Read article June 23, 2025 · 8 minThe PRISMA Flow Diagram ExplainedThe four-phase chart that traces every record through your review, the counts each phase needs, and why the arithmetic has to add up.Read article June 17, 2025 · 9 minSystematic Review Screening Tools and Software ComparedWhat screening platforms do, which features actually matter, and how to pick between free and end-to-end paid tools.Read article June 11, 2025 · 8 minDeduplicating Search Results for a Systematic ReviewWhy removing duplicate records before screening matters, how to catch near matches, and which counts your flow diagram needs.Read article June 4, 2025 · 9 minHow Many Reviewers Do You Need for Screening?Why two independent reviewers plus a third adjudicator is the standard for screening, and what to do when your team is small.Read article May 27, 2025 · 9 minFull-Text Screening in a Systematic ReviewThe second, decisive selection pass: retrieving reports, applying criteria at full force, and logging one reason per exclusion.Read article May 23, 2025 · 8 minResolving Screening Conflicts in a Systematic ReviewWhy disagreements are useful, the two ways to settle them, and how to record resolutions so your flow diagram stays auditable.Read article May 19, 2025 · 9 minTitle and Abstract Screening in a Systematic ReviewThe first selection pass, stage by stage: why it is lenient, how to screen in duplicate, pilot the criteria, and record the count.Read article May 12, 2025 · 7 minDocumenting and Reporting Your Search: PRISMA 2020Capture every database, strategy line, date, and count as you search, then report it against PRISMA 2020 so the whole search can be reproduced.Read article May 6, 2025 · 7 minPeer Review of Search Strategies: The PRESS ChecklistA second searcher audits translation, logic, headings, and syntax against PRESS, catching the invisible errors that silently drop eligible studies.Read article May 1, 2025 · 7 minCitation Chasing and Snowballing in Systematic ReviewsFollowing references backward and citations forward, then iterating, to recover the eligible studies a term-based search never caught.Read article April 26, 2025 · 8 minMeSH Terms and Subject Headings in Literature SearchingControlled vocabulary, the heading tree, exploding, and subheadings, how indexed concepts catch studies that free-text searching misses.Read article April 22, 2025 · 7 minGrey Literature Searching for Systematic ReviewsRegistries, conference abstracts, theses, reports, and preprints, the unpublished evidence that keeps a review from overstating an effect.Read article April 17, 2025 · 7 minDatabases for Systematic Reviews: Which to SearchWhy one database is never enough, the usual biomedical core, and how to match your source list to the discipline and document it.Read article April 12, 2025 · 8 minBoolean Operators for Literature Searching, ExplainedAND, OR, NOT, truncation, and proximity, and the one combination rule that keeps your search logic correct and auditable line by line.Read article April 8, 2025 · 8 minSearch Strategy for a Systematic Review: How to Build OneConcept blocks, subject headings plus free-text terms, and Boolean logic, the anatomy of a strategy that is sensitive, testable, and reproducible.Read article April 3, 2025 · 9 minHow to Do a Systematic Literature Search: A Practical GuideFrom question to recorded result set: the full workflow for a reproducible search that finds every relevant study, not just a convenient sample.Read article March 31, 2025 · 7 minAmending a Systematic Review ProtocolWhich protocol changes need an amendment, how to record one properly, and why a change before results matters far less than one after.Read article March 28, 2025 · 7 minPROSPERO vs OSF Registration for Systematic ReviewsWhere PROSPERO wins, where OSF wins, and a two-question test for choosing the right place to register your review.Read article March 24, 2025 · 9 minFraming a Research Question for a Systematic ReviewHow to turn a vague aim into one answerable question, check it has not been answered already, and scope it so the review is finishable.Read article March 19, 2025 · 10 minInclusion and Exclusion Criteria for Systematic ReviewsThe dimensions your eligibility criteria must cover, how to avoid the inclusion-exclusion double count, and why a quick pilot saves weeks.Read article March 14, 2025 · 7 minHow to Register a Systematic Review on PROSPEROWhat PROSPERO accepts, how the submission form works step by step, and why a public timestamp protects your review from selective reporting.Read article March 9, 2025 · 9 minQuestion Frameworks for Systematic Reviews: PICO, PCC, SPIDERPICO, PCC, and SPIDER side by side: how to match the framework to your question type instead of forcing the question to fit.Read article March 3, 2025 · 9 minThe PICO Framework for Systematic Review QuestionsHow Population, Intervention, Comparator, and Outcome turn a vague aim into a question you can actually search, screen, and synthesise.Read article February 25, 2025 · 8 minHow to Write a Systematic Review ProtocolEvery section a protocol needs, from the framed question to the planned synthesis, and why pinning the methods down first protects the whole review.Read article February 24, 2025 · 10 minSystematic Review Examples and What to Learn From ThemFour illustrative review shapes that share one skeleton: question, search, screening, appraisal, synthesis. Learn to reverse-engineer the method, not copy the conclusions.Read article February 17, 2025 · 8 minHow Long Does a Systematic Review Take?Usually six to eighteen months, driven by record volume and reviewer numbers, not the topic. Here is a realistic stage-by-stage timeline and how to shorten it honestly.Read article February 10, 2025 · 9 minSteps in a Systematic Review: The Full SequenceSeven steps in a fixed order, each removing a specific source of bias: protocol, search, screening, extraction, appraisal, synthesis, and reporting.Read article February 3, 2025 · 11 minTypes of Literature Reviews: A Practical GuideNarrative, systematic, scoping, rapid, umbrella, integrative: six common review types sorted by rigour and aim, with a simple rule for picking the one your project needs.Read article January 23, 2025 · 11 minSystematic Review vs Scoping Review: Which to ChooseOne answers a focused question and rates the evidence; the other maps what exists and where the gaps are. Here is how to choose between them by intent.Read article January 16, 2025 · 11 minSystematic Review vs Meta-Analysis: How They DifferThey are not rivals but layers. A meta-analysis is one optional statistical step inside the wider systematic review, and only fits when the studies are similar enough to pool.Read article January 9, 2025 · 11 minSystematic Review vs Literature Review: Key DifferencesThe real difference is method, not topic. Here is how a reproducible systematic review differs from a narrative literature review at every stage, and when each one fits.Read article