biostudies-literatureVeroniki AASwiss National Science Foundation246https://www.ebi.ac.uk/biostudies/studies/S-EPMC8434710biostudies-literatureUnknown10(1)<h4>Background</h4>The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) extension statement for network meta-analysis (NMA) published in 2015 promotes comprehensive reporting in published systematic reviews with NMA. PRISMA-NMA includes 32 items: 27 core items as indicated in the 2009 PRISMA Statement and five items specific to the reporting of NMAs. Although NMA reporting is improving, it is unclear whether PRISMA-NMA has accelerated this improvement. We aimed to investigate the impact of PRISMA-NMA and highlight key items that require attention and improvement.<h4>Methods</h4>We updated our previous collection of NMAs with articles published between April 2015 and July 2018. We assessed the completeness of reporting for each NMA, including main manuscript and oSystematic reviewsDo reporting guidelines have an impact? Empirical assessment of changes in reporting before and after the PRISMA extension statement for network meta-analysis.PMC8434710320030179158Tricco ACTsokani SPapakonstantinou TSalanti GVeroniki AAMavridis DPagkalidou IChaimani AStraus SEKontouli KMLunny CAmbarcioglu PZevgiti SHutton BNikolakopoulou APandis NfalseDo reporting guidelines have an impact? Empirical assessment of changes in reporting before and after the PRISMA extension statement for network meta-analysis.<h4>Background</h4>The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) extension statement for network meta-analysis (NMA) published in 2015 promotes comprehensive reporting in published systematic reviews with NMA. PRISMA-NMA includes 32 items: 27 core items as indicated in the 2009 PRISMA Statement and five items specific to the reporting of NMAs. Although NMA reporting is improving, it is unclear whether PRISMA-NMA has accelerated this improvement. We aimed to investigate the impact of PRISMA-NMA and highlight key items that require attention and improvement.<h4>Methods</h4>We updated our previous collection of NMAs with articles published between April 2015 and July 2018. We assessed the completeness of reporting for each NMA, including main manuscript and o2021-01-01T00:00:00Z2021 Sep2026-05-09T04:41:15.493Z2022-02-11T10:54:16.861ZS-EPMC84347103450762110.1186/s13643-021-01780-9