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Table 2 Robson classification in Birth in Brazil study, 2011–2012

From: Use of Robson classification to assess cesarean section rate in Brazil: the role of source of payment for childbirth

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
  1. 1 (Number of deliveries in the group) / (total number of deliveries)
  2. 2 (Number of cesarean deliveries in the group) / (total number of deliveries)
  3. 3 (Number of cesarean deliveries in the group) / (total number of cesarean deliveries)