Risk of First-stage and Second-stage Cesarean Delivery by Maternal Body Mass Index Among Nulliparous Women in Labor at Term

OBJECTIVE:To estimate in a cohort of nulliparous women in labor at term whether cesarean delivery rates are increased in first and second stages of labor in overweight and obese women and whether being overweight or obese is an independent risk factor for cesarean delivery.METHODS:Nulliparous women