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. 2021 Jan 19;81(1):61–69. doi: 10.1055/a-1295-0752

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The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commecial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License, which permits unrestricted reproduction and distribution, for non-commercial purposes only; and use and reproduction, but not distribution, of adapted material for non-commercial purposes only, provided the original work is properly cited.

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Fig. 1 — Comparison of 17-OHPC versus placebo. Outcomes: preterm birth < 37 weeks of gestation ( a ), < 35 weeks of gestation ( b ), < 32 weeks of gestation ( c ). Forest plots of the relative risk and the associated 95% confidence intervals for preterm birth < 37 weeks of gestation ( a ), < 35 weeks of gestation ( b ) and < 32 weeks of gestation ( c ). 17-OHPC: 17-hydroxyprogesterone caproate, CI: confidence interval.