Chart 1. Robson Ten Group Classification System 10 .
| Group | Description |
|---|---|
| 1 | Nulliparous, singleton, cephalic, ≥ 37 weeks of gestation, in spontaneous labor |
| 2 | Nulliparous, singleton, cephalic, ≥3 7 weeks of gestation, induced labor or cesarean section before labor |
| 3 | Multiparous (excluding previous cesarean section), singleton, cephalic, ≥ 37 weeks of gestation, in spontaneous labor |
| 4 | Multiparous without a previous uterine scar, with singleton, cephalic pregnancy, ≥ 37 weeks of gestation, induced or cesarean section before labor |
| 5 | Previous cesarean section, singleton, cephalic, ≥ 37 weeks of gestation |
| 6 | All nulliparous with a single breech |
| 7 | All multiparous with a single breech (including previous cesarean section) |
| 8 | All multiple pregnancies (including previous cesarean section) |
| 9 | All women with a single pregnancy in transverse or oblique lie (including those with previous cesarean section) |
| 10 | All singleton, cephalic, < 37 weeks of gestation (including previous cesarean section) |