Table 2 Effect of the intervention on primary outcome and maternal process-of-care outcomes

Primary outcome

Cesarean section in Robson Group 1

1,709/4,302

(39.7)

1,602/3,543

(45.2)

0.85 (0.54–1.33)

Maternal process-of-care outcomes

Cesarean section in women in Robson Groups 1 and 3

2,012/7,485

(26.9)

1,919/6,204

(30.9)

0.81 (0.59–1.11)

Cesarean section in women in Robson Groups 1, 2, 3, 4 and 5

6,529/12,735

(51.3)

5,028/9,808

(51.3)

0.92 (0.78–1.10)

Cesarean section (all women)

7,505/14,814

(50.7)

5,817/11,517

(50.5)

0.91 (0.71–1.15)

Augmentation with oxytocin during labor^a

912/9,764

(9.3)

2,273/8,318

(27.3)

0.34 (0.01–15.04)

Artificial rupture of the membranes^a,d

553/9,764

(5.7)

559/8,318

(6.7)

-

Episiotomy^b

4,820/7,309

(65.9)

3,137/5,700

(55.0)

0.99 (0.73–1.35)

Operative vaginal birth^b

192/7,309

(2.63)

112/5,700

(1.96)

1.12 (0.13–9.36)

Days from admission to childbirth^c

0.34

(0.73)

0.30

(0.68)

0.05 (−0.31–0.41)

Days from childbirth to discharge^c

3.29

(1.75)

3.52

(1.88)

0.23 (−0.84–1.30)