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Table 3 Standard 10-group (Robson) classification table, 2004-2005 Global Survey in Latin America.

From: WHO Global Survey on Maternal and Perinatal Health in Latin America: classifying caesarean sections

Group
(a)
Obstetric population
(b)
Relative size of the group
(n, % and range)
(c)
CS rate
(n, % and range)
(d)
Absolute contribution to CS rate (% and range)
(e)
Relative contribution to CS rate (% and range)
(f)
1 Nulliparous with single cephalic pregnancy, ≥37 wks gestation in spontaneous labour 26576
27.7
(23.1-32.2)
6172
23.2
(13.9-37.2)
6.4
(4.0-10.0)
18.2
(13.5-24.8)
2 Nulliparous with single cephalic pregnancy, ≥37 wks gestation who either had labour induced or were delivered by CS before labour 8376
8.7
(5.6-14.3)
5142
61.4
(41.7-74.0)
5.4
(2.8-8.4)
15.2
(6.9-23.6)
3 Multiparous without a previous uterine scar, with single cephalic pregnancy, ≥37 wks gestation in spontaneous labour 30909
32.3
(26.4-34.8)
3044
9.9
(4.5-17.3)
3.2
(1.5-6.0)
9.0
(4.3-14.9)
4 Multiparous without a previous uterine scar, with single cephalic pregnancy, ≥37 wks gestation who either had labour induced or were delivered by CS before labour 6704
7.0
(3.8-10.5)
2822
42.1
(22.8-60.4)
3.0
(1.5-5.3)
8.3
(3.7-14.9)
5 All multiparous with at least one previous uterine scar, with single cephalic pregnancy, ≥37 wks gestation 10890
11.4
(8.7-14.1)
9042
83.0
(76.9-95.9)
9.4
(7.9-12.0)
26.7
(23.6-32.2)
6 All nulliparous women with a single breech pregnancy 1409
1.5
(1.0-2.0)
1258
89.3
(82.2-91.0)
1.3
(0.9-1.8)
3.7
(2.2-5.3)
7 All multiparous women with a single breech pregnancy including women with previous uterine scars 1794
1.9
(1.5-2.7)
1482
82.6
(77.8-88.1)
1.6
(1.2-2.2)
4.4
(3.7-6.2)
8 All women with multiple pregnancies including women with previous uterine scars 954
1.0
(0.6-1.3)
690
72.3
(63.6-82.0)
0.7
(0.4-1.0)
2.0
(1.0-3.0)
9 All women with a single pregnancy with a transverse or oblique lie, including women with previous uterine scars 1419
1.5
(0.4-3.8)
1335
94.1
(77.6-100.0)
1.4
(0.3-3.6)
3.9
(1.0-8.9)
10 All women with a single cephalic pregnancy ≥36 wks gestation, including women with previous scars 6773
7.1
(4.7-9.2)
2913
43.0
(32.8-50.5)
3.0
(1.5-4.3)
8.6
(4.2-11.4)
  Total 95804
100
33900
35.4
35.4 100
  1. Standard 10-group classification table including: (a) group number in the 10-group classification; (b) description of the obstetric population in of each group; (c) number and proportion of the obstetric population in each group; (d) number and proportion of CS in each group; (e) absolute contribution of each group to the total CS rate; (f) relative contribution of each group to the total CS rate. Highest and lowest country proportions are presented in parenthesis.