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Fig. 1 | BMC Pregnancy and Childbirth

Fig. 1

From: Maternal vitamin D status in early pregnancy and its association with gestational diabetes mellitus in Shanghai: a retrospective cohort study

Fig. 1

Restricted cubic spline curve association between vitamin D concertrations (ng/mL) and GDM risk, adjusted for maternal age, and prepregnancy BMI. A vitamin D level of 20 ng/mL was selected as the reference level. The blue areas represent 95% CIs. Knots were located at the 5th, 50th and 95th percentiles. Dashed vertical lines represent the category thresholds of 20 ng/mL (deficiency) and 30 ng/mL (sufficiency)

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BMC Pregnancy and Childbirth

ISSN: 1471-2393

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