Primary Cesarean Delivery Among Parous Women in the United States, 1990–2003

To explore trends in primary cesarean delivery rates among parous women with singleton pregnancies in the United States between 1990 and 2003.The analysis used data from national birth files based on U.S. birth certificates between 1990 and 2003. The primary cesarean delivery rate was defined as the number of primary cesarean deliveries per 100 deliveries among parous women with singleton pregnancies who have not had a previous cesarean...