Fig. 1.

Adjusted* risk ratios^† for cesarean delivery by body mass index (BMI), low-risk^‡ mothers with no prior cesarean, 38 states, 2012. *Adjusted for maternal age, race/ethnicity, education, trimester prenatal care began, nativity (US or foreign-born), method of payment for the delivery, and prepregnancy and gestational diabetes and hypertension. ^†“Normal weight” (BMI 18.5–24.9) was the reference group; error bars represent 95% confidence intervals. ^‡Singleton, vertex, 37–41 weeks of gestational age. LBO = live birth order.