Upon their publication in 2009, the PRISMA guidelines have become the standard for reporting in systematic reviews and meta-analyses. Now, 11 years later, the PRISMA checklist has received a fresh facelift for 2020 that incorporates the methodological advances that have taken place over the intervening years.
In a recently released pre-print, Page and colleagues describe their approach to designing the new and improved PRISMA. Sixty reporting documents were reviewed to identify any new items deserving of consideration and 110 systematic review methodologists and journal editors were surveyed for feedback. The new PRISMA 2020 draft was then developed based on discussion at an in-person meeting and iteratively revised based on co-author input and a sample of 15 experts.
The result is an expanded, 27-item checklist replete with elaboration of the purpose for each item, a sub-checklist specifically for reporting within the abstract, and revised flow diagram templates for both original and updated systematic reviews. Here are some of the major changes and additions to be aware of:
- Recommendation to present search strategies for all databases instead of just one.
- Recommendation that authors list "near-misses," or studies that met many but not all inclusion criteria, in the results section.
- Recommendation to assess certainty of synthesized evidence.
- New item for declaration of Conflicts of Interest.
- New item to indicate whether data, analytic code, or other materials have been made publicly available.