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Table 3 Robson classification system for cesarean birth

From: Cesarean birth in the Global Network for Women’s and Children’s Health Research: trends in utilization, risk factors, and subgroups with high cesarean birth rates

Robson group Description
1 Nulliparous women with single cephalic pregnancy, ≥ 37 weeks gestation in spontaneous labor
2 Nulliparous women with single cephalic pregnancy, ≥ 37 weeks gestation who either had labor induced or were delivered by cesarean section before labor
3 Multiparous women without a previous uterine scar, with single cephalic pregnancy, ≥ 37 weeks gestation in spontaneous labor
4 Multiparous women without a previous uterine scar, with single cephalic pregnancy, ≥ 37 weeks gestation who either had labor induced or were delivered by cesarean section before labor
5 All multiparous women with at least one previous uterine scar, with single cephalic pregnancy, ≥ 37 weeks gestation
6 All nulliparous women with a single breech pregnancy
7 All multiparous women with a single breech pregnancy, including women with previous uterine scars
8 All women with multiple pregnancies, including women with previous uterine scars
9 All women with a single pregnancy with a transverse or oblique lie, including women with previous uterine scars
10 All women with a single cephalic pregnancy < 37 weeks gestation, including women with previous scars