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Table 3 Robson group by source of payment of birth. 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,a CS rate in each group2,b Relative contribution on the overall CS rate3,c
   Public Private Public Private Public Private Public Private Public Private
% 95 % CI % 95 % CI % 95 % CI % 95 % CI % 95 % CI % 95 % CI
1 Nulliparous women, single cephalic, > = 37 weeks, in spontaneous labor 712 136 4,023 307 21.0 (19.5–22.2) 6.4 (5.1–7.7) 17.7 (15.1–20.6) 44.4 (35.5–53.5) 8.7 (7.5–10.1) 3.2 (2.6–4.1)
2 Nulliparous women, single cephalic, > = 37 weeks, induced or CS before labour 2,351 1,818 3,116 1,872 16.3 (15.2–17.1) 39.3 (36.2–40.7) 75.4 (71.2–79.2) 97.1 (93.3–98.8) 28.6 (26.9–30.4) 43.4 (41.2–45.7)
Nulliparous women, single cephalic, > = 37 weeks, induced labor 566 52 1,331 106 7.0 (6.1–8.0) 2.2 (1.3–3.7) 42.5 (36.8–48.4) 49.1 (29.6–69.1) 6.9 (5.7–8.3) 1.2 (0.8–1.9)
2b Nulliparous women, single cephalic, > = 37 weeks, CS before labor 1,785 1,766 1,785 1,766 9.3 (8.5–10.3) 37.1 (34.5–39.7) 100.0 - 100.0 - 21.8 (20.3–23.3) 42.2 (39.9–44.4)
3 Multiparous women (excluding prev. CS), single cephalic, > = 37 weeks, in spontaneous labor 234 30 4,520 255 23.6 (22.3–24.6) 5.4 (4.0–6.9) 5.2 (4.1–6.5) 11.8 (7.2–18.1) 2.9 (2.3–3.5) 0.7 (0.5–1.0)
4 Multiparous without a previous uterine scar, with single cephalic pregnancy, > = 37 weeks, induced or CS before labor 758 270 1,379 306 7.2 (6.5–7.8) 6.4 (5.3–7.4) 55.0 (50.0–59.8) 88.2 (80.1–93.2) 9.2 (8.4–10.1) 6.4 (5.4–7.6)
Multiparous women without a previous uterine scar, with single cephalic pregnancy, > = 37 weeks, induced labor 118 9 739 45 3.9 (3.3–4.5) 0.9 (0.6–1.6) 16.0 (13.0–19.6) 19.5 (8.7–38.1) 1.4 (1.1–1.8) 0.2 (0.1–0.5)
4b Multiparous women without a previous uterine scar, with single cephalic pregnancy, > = 37 weeks, CS before labor 640 261 640 261 3.3 (3.0–3.8) 5.5 (4.5–6.6) 100.0 - 100.0 - 7.8 (7.0–8.6) 6.2 (5.2–7.4)
5 Previous CS, single cephalic, > = 37 weeks 2,556 1,260 3,276 1,286 17.1 (16.0–18.0) 27.0 (24.8–28.1) 78.0 (75.4–80.4) 98.0 (96.5–98.9) 31.1 (29.7–32.7) 30.1 (28.5–31.8)
6 All nullipara breeches 271 138 286 139 1.5 (1.3–1.7) 2.9 (2.0–4.0) 94.4 (91.2–96.9) 99.3 (96.5–99.9) 3.3 (2.8–3.8) 3.3 (2.3–4.6)
7 All multipara breeches (including prev. CS) 276 62 336 63 1.8 (1.5–2.1) 1.3 (1.0–1.7) 82.1 (71.9–89.1) 98.4 (93.0–99.6) 3.4 (2.9–3.9) 1.5 (1.2–1.9)
8 All multiple pregnancies (including prev. CS) 153 87 191 92 1.0 (0.8–1.2) 1.9 (1.5–2.6) 79.7 (72.1–85.6) 94.6 (72.7–99.1) 1.9 (1.5–2.3) 2.1 (1.5–3.0)
9 All abnormal lies (including prev. CS) 91 23 91 23 0.5 (0.4–0.6) 0.5 (0.3–0.8) 100.0 - 100.0 - 1.1 (0.9–1.4) 0.5 (0.3–0.9)
10 All single cephalic, <=36 weeks (including prev. CS) 803 363 1,904 422 10.0 (8.7–11.2) 8.9 (7.1–10.6) 42.2 (38.7–45.7) 86.0 (78.3–91.1) 9.8 (8.3–11.5) 8.7 (6.9–10.9)
X Unable to classify 2 1 6 1 0.03 (0.01–0.07) 0.02 (0.002–0.01) 40.2 (7.8–84.2) 100.0 - 0.0 - 0.0 -
  Total deliveries 8,207 4,188 19,128 4,766 100.0 - 100.0 - 41.5 - 87.9 - 100.0   100.0  
  1. 1 (Number of deliveries in the group) / (total number of deliveries)
  2. 2 (Number of cesarean deliveries) / (number of deliveries in the same Robson group)
  3. 3 (Number of cesarean deliveries in the group) / (total number of cesarean deliveries)
  4. a Public vs. Private proportions differed significantly from each other at the .05 level by means of z-test with Bonferroni adjustment for all Robson group, except for groups 4, 7, 9, 10 and X
  5. b Public vs. Private proportions differed significantly from each other at the .05 level by means of z-test with Bonferroni adjustment for all Robson group, except for groups 2a, 4a and 8
  6. c Public vs. Private proportions differed significantly from each other at the .05 level by means of z-test with Bonferroni adjustment for all Robson group, except for groups 4b, 5, 6, 8 and 10