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. 2021 Feb 23;7(1):e000920. doi: 10.1136/bmjsem-2020-000920

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license, which permits others to copy, redistribute, remix, transform and build upon this work for any purpose, provided the original work is properly cited, a link to the licence is given, and indication of whether changes were made. See: https://creativecommons.org/licenses/by/4.0/.

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Subgroup analyses comparing the mean scores of reviews published in a higher versus a lower impact factor (IF) journals. Those published in higher if journals (>4.7; n=10) had a significantly higher mean score than those (n=47) in lower if journals (68.3% vs 41.8%, difference 26.5%±8.8%, p=0.004) (A). The first 10 published SRs (2006–2012) had a slightly lower mean score (48.3%) than the 10 most recently published ones (2019–2020; 56.6%) with a statistically insignificant difference (8.3%±13.7%, p=0.54; B). SRs, systematic reviews.