Table. 2 Relative size and caesarean delivery rates in Brazil using 10- group classification, 2011–2017

1

Nulliparous women with a single cephalic pregnancy, ≥ 37 weeks gestation in spontaneous labour

16.1

43.8

7.1

< 10 %

2

Nulliparous women with a single cephalic pregnancy, ≥ 37 weeks gestation who had labour induced or were delivered by CS before labour

17.2

67.6

11.6

20–35 %

2a

Labour induced

7.32

24

1.8

-

2b

Pre-labour CS

9.86

100

9.9

-

3

Multiparous women without a previous uterine scar, with a single cephalic pregnancy, > 37 weeks gestation in spontaneous labour

18.6

17.5

3.3

< 3 %

4

Multiparous women without a previous CS, with a single cephalic pregnancy, ≥ 37 weeks gestation who had labour induced or were delivered by CS before labour

11.2

42.3

4.7

15 %

4a

Labour induced

7.21

10.3

0.7

-

4b

Pre-labour CS

4.01

100

4

-

5

All multiparous women with at least one previous CS, with a single cephalic pregnancy, ≥ 37 weeks gestation

21.7

84.9

18.4

50–60 %

6

All nulliparous women with a single breech pregnancy

1.38

89.4

1.2

-

7

All multiparous women with a single breech pregnancy including women with previous CS

1.86

84.4

1.6

-

8

All women with multiple pregnancies including women with previous CS

2

82

1.7

60 %

9

All women with a single pregnancy with a transverse or oblique lie, including women with previous CS(s)

0.22

96.8

0.2

-

10

All women with a single cephalic pregnancy < 37 weeks gestation, including women with previous CS

9.7

48.8

4.8

30 %