Robson Group
Patient population
1 Nulliparous, singleton, cephalic, ≥37 weeks, spontaneous labor
2a Nulliparous, singleton, cephalic, ≥37 weeks, induction of labor
2b Nulliparous singleton, cephalic, ≥37 weeks, pre-labor cesarean
3 Multiparous (excluding previous cesareans), singleton, cephalic, ≥37 weeks, spontaneous labor
4a Multiparous (excluding previous cesareans), singleton, cephalic, ≥37 weeks, induction of labor
4b Multiparous singleton, cephalic, ≥37 weeks, pre-labor cesarean
5 Previous cesarean, singleton cephalic ≥37 weeks
6 All nulliparous breeches
7 All multiparous breeches (including previous cesareans)
8 All multiple pregnancies (including previous cesareans)
9 All singleton abnormal lies (including previous cesareans)
10 All singleton cephalic, ≤36 weeks (including previous cesareans)