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. 2022 Aug 30;11(17):5100. doi: 10.3390/jcm11175100

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Forest plots for cognitive ability results. (a) Overall effect [28,29,30,32,41,46,49,54,55,56,58,59]. (b) Results after exclusion of studies with no blinding of outcome assessment [28,29,30,41,46,49,54,55,56,58,59].