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. 2021 Sep 15;374:n1864. doi: 10.1136/bmj.n1864

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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.

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Fig 4 — Forest plot of comparisons between bodies of evidence from randomised controlled trials versus cohort studies for binary outcomes as pooled ratio of risk ratios, stratified by the similarity degree of PI/ECO category (broadly similar). CS=cohort study; PI/ECO=population, intervention or exposure, comparator, outcome; RCT=randomised controlled trial; RR=risk ratio; MCI=mild cognitive impairment; omega 3=omega 3 fatty acid; Abdelhamid 2018a=reference 37; Bjelakovic 2014a=reference 43; Bjelakovic 2014b=reference 42; Chowdhury 2014a=reference 67; Chowdhury 2014b=reference 75; Rees 2013b=reference 58; Zhang 2016a=reference 93