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Objective: To determine risk factors for cesarean delivery in nulliparas at labor admission., Study Design: Nulliparas with live-born, singleton gestations ⩾37 weeks in spontaneous or induced labor were analyzed from the Consortium on Safe Labor database in a retrospective observational study. Classification and regression tree (CART) and multivariate logistic regression analysis determined risk factors for cesarean delivery., Result: Of the 66 539 nulliparas, 22% had a cesarean delivery. In the CART analysis, the first cervical dilation exam was the first branch followed by body mass index (BMI). Cesarean deliveries occurred in 45%, 25%, 14% and 10% of deliveries at <1, 1 to 3, 4 and ⩾5 cm dilated, respectively. The BMI influence was most evident in the <1 cm dilation category with 26% of BMI <25 kg m(-2) and 66% of BMI ⩾40 kg m(-2) having a cesarean delivery. The fewest cesarean deliveries (5%) occurred in those ⩾5 cm and BMI <25 kg m(-2). In the multivariate regression analysis, first cervical dilation exam <1 cm (odds ratio (OR) 5.1, 95% confidence interval (CI): 4.5 to 5.7; reference ⩾5 cm) and BMI ⩾40 kg m(-2) (OR 5.1, 95% CI: 4.6 to 5.7; reference BMI <25.0 kg m(-2)) had the highest odds for cesarean delivery., Conclusion: Cervical dilation on admission followed by BMI were the two most important risk factors for cesarean delivery identified in both CART and multivariate regression analysis.

Objective: We sought to assess body mass index (BMI) effect on cesarean risk during labor., Study Design: The Consortium on Safe Labor collected electronic data from 228,668 deliveries. Women with singletons > or = 37 weeks and known BMI at labor admission were analyzed in this cohort study. Regression analysis generated relative risks for cesarean stratifying for parity and prior cesarean while controlling for covariates., Results: Of the 124,389 women, 14.0% had cesareans. Cesareans increased with increasing BMI for nulliparas and multiparas with and without a prior cesarean. Repeat cesareans were performed in > 50% of laboring women with a BMI > 40 kg/m(2). The risk for cesarean increased as BMI increased for all subgroups, P < .001. The risk for cesarean increased by 5%, 2%, and 5% for nulliparas and multiparas with and without a prior cesarean, respectively, for each 1-kg/m(2) increase in BMI., Conclusion: Admission BMI is significantly associated with delivery route in term laboring women. Parity and prior cesarean are other important predictors., (Copyright 2010 Mosby, Inc. All rights reserved.)

Objective: We sought to compare labor patterns by body mass index (BMI). Study Design: A total of 118,978 gravidas with a singleton term cephalic gestation were studied. Repeated-measures analysis constructed mean labor curves by parity and BMI categories for those who reached 10 cm. Interval-censored regression analysis determined median traverse times, adjusting for covariates in vaginal deliveries and intrapartum cesareans. Results: In the labor curves, the time difference to reach 10 cm was 1.2 hours from the lowest to highest BMI category for nulliparas. Multiparas entered active phase by 6 cm, but reaching this point took longer for BMI ≥40.0 (3.4 hours) compared to BMI <25.0 (2.4 hours). Progression by centimeter (P < .001 for nulliparas) and from 4-10 cm (P < .001 for nulliparas and multiparas) increased as BMI increased. Second stage length, with and without an epidural, was similar among BMI categories for nulliparas (P > .05) but decreased as BMI increased for multiparas (P < .001). Conclusion: Labor proceeds more slowly as BMI increases, suggesting that labor management be altered to allow longer time for these differences. [ABSTRACT FROM AUTHOR]