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. 2020 Jan 31;10:1620. doi: 10.3389/fphys.2019.01620

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Copyright © 2020 Wu, Lin, Zhang, Cao, Liang and Zhou.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Forest plot of the studies regarding gender. (A) Forest plot of the studies regarding association between Hb and gender; (B) Forest plot of the studies regarding association between RBC counts and gender.; (C) Forest plot of the studies regarding association between MCV and gender. SMD, standardized mean difference; CI, confidence intervals; (a) means of female participants in the studies, (b) means of male participants in studies.