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)