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Aims : To assess the influence of obesity on pregnancy and delivery in pregnant nulliparous women. Methods: A cohort, longitudinal, retrospective study was conducted in Spain with 710 women, of which 109 were obese (BMI > 30) and 601 were normoweight (BMI < 25). Consecutive nonrandom sampling.  Variables : maternal age, BMI, gestational age, fetal position, start of labor, dilation and expulsion times, type of delivery and newborn weight and height. Results: The dilation time in obese women (309.81 ± 150.42 min) was longer than that in normoweight women (281.18 ± 136.90 min) ( p  = 0.05, Student’s  t -test). A higher fetal weight was more likely to lead to longer dilation time (OR = 0.43, 95% CI 0.010–0.075,  p  < 0.001) and expulsion time (OR = 0.027, 95% CI 0.015–0.039,  p  < 0.001). A higher maternal age was more likely to lead to a longer expulsion time (OR = 2.054, 95% CI 1.17–2.99,  p  < 0.001). Obese women were more likely to have gestational diabetes [relative risk (RR) = 3.612, 95% CI 2.102–6.207,  p  < 0.001], preeclampsia (RR = 5.514, 95% CI 1.128–26.96,  p  = 0.05), induced birth (RR = 1.26, 95% CI 1.06–1.50,  p  = 0.017) and cesarean section (RR = 2.16, 95% CI 1.11–4.20,  p  = 0.022) than normoweight women.  Conclusion : Obesity is associated with increased complications during pregnancy, an increased incidence of a cesarean section and induced birth but it has no significant effect on the delivery time.

Influence of Body Mass Index on Gestation and Delivery in Nulliparous Women: A Cohort Study