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