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Transparent reporting of key items increased over the years. About 7 out of 10 named their article a SR (2000-2004 41.9% and 2015-2019 74.4%). In 2000-2004, 32.3% of SRs were based in the UK (0% in China), in 2015-2019 24.0% were from China and 10.8% from the UK. Nearly all articles from China (94.9%) conducted a meta-analysis (overall 58.9%). Cochrane reviews (n=84; 7.4%) less often imposed language restrictions, but often did not report the number of records and full texts screened and did not name their article a SR (22.6% vs. 73.4%).