Robson group | Description of obstetric populations | Number of cesarean deliveries | Number of deliveries | Relative (%) size of group1 | CS rate (%) in each group | Absolute contribution (%) on the overall CS rate2 | Relative (%) contribution on the overall CS rate3 |
---|---|---|---|---|---|---|---|
1 | Nulliparous women, single cephalic, > = 37 weeks, in spontaneous labor | 848 | 4,330 | 18.1 | 19.6 | 3.5 | 6.8 |
2 | Nulliparous women, single cephalic, > = 37 weeks, induced or CS before labor | 4,169 | 4,988 | 20.9 | 83.6 | 17.4 | 33.6 |
2a | Nulliparous women, single cephalic, > = 37 weeks, induced labor | 618 | 1,437 | 6.0 | 43.0 | 2.6 | 5.0 |
2b | Nulliparous women, single cephalic, > = 37 weeks, CS before labor | 3,551 | 3,551 | 14.9 | 100.0 | 14.9 | 28.6 |
3 | Multiparous women (excluding prev. CS), single cephalic, > = 37 weeks, in spontaneous labor | 264 | 4,775 | 20.0 | 5.5 | 1.1 | 2.1 |
4 | Multiparous women without a previous uterine scar, with single cephalic pregnancy, > = 37 weeks, induced or CS before labor | 1,028 | 1,685 | 7.1 | 61.0 | 4.3 | 8.3 |
4a | Multiparous women without a previous uterine scar, with single cephalic pregnancy, > = 37 weeks, induced labor | 127 | 784 | 3.3 | 16.2 | 0.5 | 1.0 |
4b | Multiparous women without a previous uterine scar, with single cephalic pregnancy, > = 37 weeks, CS before labor | 901 | 901 | 3.8 | 100.0 | 3.8 | 7.3 |
5 | Previous CS, single cephalic, > = 37 weeks | 3,816 | 4,562 | 19.1 | 83.6 | 16.0 | 30.8 |
6 | All nullipara breeches | 409 | 425 | 1.8 | 96.2 | 1.7 | 3.3 |
7 | All multipara breeches (including prev. CS) | 338 | 399 | 1.7 | 84.7 | 1.4 | 2.7 |
8 | All multiple pregnancies (including prev. CS) | 240 | 283 | 1.2 | 84.8 | 1.0 | 1.9 |
9 | All abnormal lies (including prev. CS) | 114 | 114 | 0.5 | 100.0 | 0.5 | 0.9 |
10 | All single cephalic, <=36 weeks (including prev. CS) | 1,166 | 2,326 | 9.7 | 50.1 | 4.9 | 9.4 |
X | Unable to classify | 3 | 7 | 0.0 | 42.9 | 0,0 | 0.0 |
Total | 12,395 | 23,894 | 100 | 51.9 | 51.9 | 100 |