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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

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Fig. 3 — Combined effect of maternal vitamin D concentrations and pregregnancy BMI on early fetal growth. Panel A displays a heat map for the association of first trimester CRL (red color indicates higher CRL, blue color indicates lower CRL) according to the interaction of vitamin D-BMI. Panel B displays a heat map for the association of incidence of FGR (red color indicates higher incidence; blue color indicates lower incidence) according to the interaction of vitamin D-BMI. n = 15,651, P values are based on the ordinal linear regression model by adding a product interaction term to the model (First trimester Vitamin D × BMI)