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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)