methods
Study Design and Oversight We performed a multicenter, randomized, controlled trial comparing the rate of cesarean section between women assigned to induction of labor between 39 weeks 0 days and 39 weeks 6 days of gestation and those assigned to expectant management. Eligible women were nulliparous, were to be 35 years of age or older on their expected due date, and had a singleton live fetus in a cephalic presentation. Participants were recruited between August 2012 and March 2015 at 38 National Health Service (NHS) hospitals and 1 Primary Care Trust organization in the United Kingdom.