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. 2021 Oct 17;61(2):915–924. doi: 10.1007/s00394-021-02695-w

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© The Author(s) 2021, corrected publication 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — The association of maternal BMI and Vitamin D status with CRL in early pregnancy. Plots show the linear regression models for first-trimester vitamin D (A), prepregnancy BMI (B) and CRL as predicted mean (line) with CI (gray area) in the full range of CRL. n = 15,651, P values are based on the ordinal linear regression model with three knots of restricted cubic spline. Analyses were adjusted for maternal age, BMI, parity, season at vitamin D testing, fetal sex. BMI body mass index, CRL crown-rump length