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. Author manuscript; available in PMC: 2016 Sep 14.
Published in final edited form as: Am J Obstet Gynecol. 2014 Nov 13;212(4):511.e1–511.e7. doi: 10.1016/j.ajog.2014.11.009

FIGURE. Dose-response association between maternal serum 25(OH)D concentrations at <20 weeks’ gestation and risk of preeclampsia.

FIGURE

Solid line represents the odds ratio (OR) relative to 50 nmol/L, and dotted lines represent 95% confidence intervals (CIs). Dose-response relationship was modeled with restricted cubic splines using logistic regression. Adjustment is made for prepregnancy body mass index, parity, and variables forced in model maternal age, smoking during pregnancy, season of blood collection, year of blood collection, gestational age at blood collection, and study site (Halifax, Nova Scotia, or Quebec City, Quebec).

25(OH)D, 25-hydroxyvitamin D.