Update to the PRISMA guidelines for network meta-analyses and scoping reviews and development of guidelines for rapid reviews: a scoping review protocol

Objective: The objective of this scoping review is to develop a list of items for potential inclusion in the Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) reporting guidelines for network meta-analysis (NMA), scoping reviews (ScRs), and rapid reviews (RRs). Introduction: The PRISMA extensions for NMA and ScRs were published in 2015 and 2018. However, since then, their methodologies and innovations, including automation, have evolved. There is no reporting guideline for RRs. In 2020, an updated PRISMA statement was published, reflecting advances in the conduct and reporting of systematic reviews. These advances are not yet incorporated into these PRISMA extensions. We will update our previous methods for scoping reviews to inform the update of PRISMA-NMA and PRISMA-ScR as well as the development of the PRISMA-RR reporting guidelines. Inclusion criteria: This review will include any study design evaluating the completeness of reporting, offering reporting guidance, or assessing methods relevant to NMA, ScRs, or RRs. Editorial guidelines and tutorials that describe items related to reporting completeness will also be eligible. Methods: We will follow the JBI guidance for scoping reviews. For each PRISMA extension, we will i) search multiple electronic databases from inception to present, ii) search for unpublished studies, and iii) scan the reference lists of included studies. There will be no language limitations. Screening and data extraction will be conducted by 2 researchers independently. A third researcher will resolve discrepancies. We will conduct frequency analyses of the identified items. The final list of items will be considered for potential inclusion in the relevant PRISMA reporting guidelines.