Preferred Reporting Items for Systematic Reviews and Meta-Analyses: The PRISMA Statement¶
Why this mattered¶
PRISMA mattered because it turned systematic-review reporting from a loose narrative convention into an explicit, auditable standard. Building on the earlier QUOROM statement, Moher and colleagues defined a 27-item checklist and a flow diagram that made authors disclose how studies were identified, screened, excluded, analyzed, and synthesized. The shift was not that PRISMA invented meta-analysis, but that it made the evidentiary trail of a review visible enough for readers, peer reviewers, clinicians, and guideline panels to judge whether conclusions followed from a reproducible process.
That standardization changed what systematic reviews could do institutionally. Once search strategies, eligibility criteria, risk-of-bias assessment, study flow, and synthesis methods were expected to be reported consistently, reviews became more usable as infrastructure for evidence-based medicine rather than as isolated summaries. Clinical guidelines, health-technology assessments, and policy reviews could cite systematic reviews with clearer expectations about transparency and completeness, while journals gained a practical reporting benchmark for accepting or rejecting review manuscripts.
Its later importance is visible in the ecosystem it helped create: PRISMA extensions for abstracts, protocols, harms, diagnostic-test accuracy, network meta-analysis, scoping reviews, and later updates such as PRISMA 2020. Those developments supported more complex forms of evidence synthesis and made large-scale review work more interoperable across medicine and public health. In that sense, PRISMA’s paradigm shift was procedural but profound: it made the credibility of secondary evidence depend not only on statistical results, but on a reported chain of decisions that others could inspect, reproduce, and challenge.
Abstract¶
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