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. 2022 Jun 30;13:924070. doi: 10.3389/fendo.2022.924070

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Copyright © 2022 Kong, Fu, Shi, Li, Zhao, Wang and Qiao

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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Estimated absolute risks of placental abnormalities and placenta-related complications at each maternal age in IVF group and non-IVF group IVF, in vitro fertilization; Non-IVF, non-in vitro fertilization; FGR, fetal growth restriction. Estimated absolute risks (probabilities) were calculated by using Poisson regression modelling with restricted cubic splines of exact maternal age, with adjustment for geographic region, maternal age, year, ethnicity, and chronic diseases before pregnancy.