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. 2021 Sep 9;6(9):e005856. doi: 10.1136/bmjgh-2021-005856

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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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Meta-analysis of the association of maternal Se concentration with PTB (A) and gestational duration (B). (A) The estimated association between Se concentration and PTB is shown as OR per 15 ng/mL increase in Se concentration. (B) The estimated association between Se concentration and gestational duration is shown as change in gestational days per 15 ng/mL increase in Se concentration. PTB, preterm birth; Se, selenium.