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

Trial of labor ended in vaginal delivery in 79% of nulliparous women ≥40 years. The risks of intrapartum cesarean section and operative vaginal delivery were higher in women ≥40 years compared with women 25-29 years, after both spontaneous onset and induction of labor. The risk of obstetric anal sphincter injury or a 5-minute Apgar score <7 was not increased.