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. 2019 Sep 3;9(9):e030342. doi: 10.1136/bmjopen-2019-030342

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© Author(s) (or their employer(s)) 2019. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Same figure as figure 3, but including all RCTs assessed on at least one dimension (as opposed to RCTs assessed on all six dimensions). Evolution of methods and reporting over time. (A) Proportion of RCTs using adequate methods, inadequate methods and poorly reported. (B–G) Proportion of RCTs at low risk of bias, high risk of bias and unclear risk of bias for each dimension assessed. See online supplementary table A1 for the definition of each dimension. RCTs, randomised controlled trials.