Delivery outcome after trial of labor in nulliparous women 40 years or older—A nationwide population‐based study

Introduction The number of women postponing childbirth until an advanced age is increasing. Our aim was to study the outcome of labor in nulliparous women ≥40 years, compared with women 25‐29 years, after both spontaneous onset and induction of labor. Material and methods The nationwide population‐based Swedish Medical Birth Register was used to study the perinatal outcome in nulliparous women with a singleton, term (gestational weeks 37‐44), live fetus in cephalic presentation and a planned vaginal delivery from 1992 to 2011. We included 7796 nulliparous women ≥40 years and 264 262 nulliparous women 25‐29 years. Prevalence and risk of intrapartum cesarean section, operative vaginal delivery, obstetric anal sphincter injury and a 5‐minute Apgar score