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• W4231130363 abstract "Abstract Background : 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 in total: 27 core items as indicated in the core 2009 PRISMA Statement and five additional items specific to the reporting of NMAs. Although reporting of NMAs is improving, it is unclear whether the PRISMA-NMA statement has accelerated this improvement. Our aim was to investigate the impact of PRISMA-NMA statement and highlight key items that require further attention and improvement. Methods : 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 online supplements, using the PRISMA-NMA checklist. We also prepared a modified version of the PRISMA-NMA checklist with 49 items to evaluate separately at a more granular level all multiple-content items. We compared average reporting scores of articles published before and after 2015. Results : In the 1,144 included NMAs the mean modified PRISMA-NMA score was 32.1 (95% CI 31.8-32.4). For one-year increase the mean modified score increased by 0.96 (95% CI 0.32 to 1.59) for 389 NMAs published until 2015 and by 0.53 (95% CI 0.02 to 1.04) for 755 NMAs published after 2015. The mean modified PRISMA-NMA score for NMAs published after 2015 was higher by 0.81 (95% CI 0.23 to 1.39) compared to before 2015 when adjusting for journal impact factor, type of review, funding, and treatment category. Description of summary effect sizes to be used, presentation of individual study data, sources of funding for the systematic review and role of funders dropped in frequency after 2015 by 6-16%. Conclusions : NMAs published after 2015 more frequently reported the five items associated with NMA compared to those published before 2015. However, improvement in reporting after 2015 is compatible with that observed on a yearly basis before 2015 and hence it could not be attributed solely to the publication of PRISMA-NMA statement. Funding : This research study received no funding. AAV, ST, SZ, KMK, and DM were funded from the European Union’s Horizon 2020 [No. 754936]. AN, TP and GS have been supported by SNSF grant agreement 320030_179158. SES is funded by a Tier 1 Canada Research Chair in Knowledge Translation. ACT is funded by a Tier 2 Canada Research Chair in Knowledge Synthesis." @default.
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• W4231130363 date "2021-02-09" @default.
• W4231130363 modified "2023-10-18" @default.
• W4231130363 title "Do Reporting Guidelines Have an Impact? Empirical Assessment of Changes in Reporting Before and After the PRISMA Extension Statement for Network Meta-analysis" @default.
• W4231130363 doi "https://doi.org/10.21203/rs.3.rs-169601/v1" @default.
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