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. 2020 May 18;20:121. doi: 10.1186/s12874-020-00966-4

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — The time trend of using quality/risk of bias tools in the analyzed articles. The three most commonly used quality/risk of bias tools in articles analyzed within this study were Cochrane, Jadad, and Oxford tools. The figure indicates that the usage of Cochrane’s tool is increasing, while the use of Jadad and Oxford tool is decreasing over time. Drop in the use of Cochrane’s tool for RoB assessment in year 2018 is explained by our inclusion criteria – unlike other analyzed years, we included only articles published in the first half of 2018