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Table 2 Obstetric characteristics of women included in each of the 10 groups.

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

Group Women included
1 Nulliparous with single cephalic pregnancy,
≥37 wks gestation in spontaneous labour
2* Nulliparous with single cephalic pregnancy,
≥37 wks gestation who either had labour
induced or were delivered by CS before labour
3 Multiparous without a previous uterine scar,
with single cephalic pregnancy,
≥37 wks gestation in spontaneous labour
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
5 All multiparous with at least one previous
uterine scar, with single cephalic
pregnancy, ≥37 wks gestation
6 All nulliparous women with a
single breech pregnancy
7 All multiparous women with a
single breech pregnancy including women
with previous uterine scars
8 All women with multiple pregnancies
including women with previous uterine scars
9 All women with a single pregnancy
with a transverse or oblique lie, including
women with previous uterine scars
10 All women with a single cephalic
pregnancy ≤36 wks gestation,
including women with previous scars
  1. * Often divided into 2a and 4a (inductions) and 2b and 4b (pre-labour CS)