Group | Obstetrical characteristics |
1 | Nulliparous, single cephalic, >37 weeks in spontaneous labor |
2 | Nulliparous, single cephalic, >37 weeks, induced or CS before labor |
3 | Multiparous (excluding previous CS), single cephalic, >37 weeks in spontaneous labor |
4 | Multiparous (excluding previous CS), single cephalic, >37 weeks, induced or CS before labor |
5 | Previous CS, single cephalic, >37 weeks |
6 | All nulliparous breeches |
7 | All multiparous breeches (including previous CS) |
8 | All multiple pregnancies (including previous CS) |
9 | All abnormal lies (including previous CS) |
10 | All single cephalic, <36 weeks (including previous CS) |