Table 1.
Ten-Group Classification System
| 1 | Nulliparous women with a single cephalic pregnancy, ≥ 37 weeks gestation in spontaneous labor |
| 2a | Nulliparous women with a single cephalic pregnancy, ≥ 37 weeks gestation who had labor induced |
| 2b | Nulliparous women with a single cephalic pregnancy, ≥37 weeks gestation who were delivered by cesarean section before labor |
| 3 | Multiparous women without a previous uterine scar, with a single cephalic pregnancy, ≥37 weeks gestation in spontaneous labor |
| 4a | Multiparous women without a previous uterine scar, with a single cephalic pregnancy, ≥37 weeks gestation who had labor induced |
| 4b | Multiparous women without a previous uterine scar, with a single cephalic pregnancy, ≥ 37 weeks gestation who were delivered by cesarean section before labor |
| 5 | All multiparous women with at least one previous uterine scar, with a 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 scar |
| 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 uterine scars |