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Table 10 Neonatal outcomes, by subgroups

From: OptiBIRTH: a cluster randomised trial of a complex intervention to increase vaginal birth after caesarean section

Outcome

Subgroup (recruited women relevant to each subgroup with baby data available in intervention; control groups)

Intervention

Control

Risk ratio [95% CI] or Mean Difference [95% CI]

Live-born before 37 weeks (% of live-born)a

Trial as a whole (1163; 777)

62 (5.3)

50 (6.4)

0.81 [0.56, 1.17]

Germany (457; 280)

18 (3.9)

16 (5.7)

0.61 [0.31, 1.21]

Ireland (358; 249)

19 (5.3)

10 (4.0)

1.23 [0.59, 2.56]

Italy (348; 248)

25 (7.2)

24 (9.7)

0.77 [0.45, 1.32]

Vaginal birth before previous CS (104; 54)

8 (7.7)

7 (13.0)

0.67 [0.26, 1.71]

No vaginal births before previous CS (1059; 723)

54 (5.1)

43 (5.9)

0.83 [0.56, 1.24]

Prior VBAC (74; 32)

3 (4.1)

1 (3.1)

0.87 [0.13, 6.02]

No prior VBAC (1089; 745)

59 (5.4)

49 (6.6)

0.81 [0.56, 1.17]

Recruitment at < 30 weeks (619; 461)

44 (7.1)

31 (6.7)

0.98 [0.62, 1.56]

Recruitment at 30–32 weeks (104; 44)

7 (6.7)

5 (11.4)

0.73 [0.26, 2.11]

Recruitment at ≥33 weeks (438; 270)

11 (2.5)

13 (4.8)

0.51 [0.24, 1.10]

BMI (< 25.00) (553; 309)

25 (4.5)

21 (6.8)

0.64 [0.37, 1.11]

BMI (25–29.99) (347; 268)

23 (6.6)

15 (5.6)

1.19 [0.61, 2.33]

BMI (> 29.99) (202; 175)

10 (5.0)

14 (8.0)

0.77 [0.34, 1.77]

Age (< 40 years) (1072; 702)

55 (5.1)

40 (5.7)

0.88 [0.59, 1.32]

Age (≥40 years) (91; 72)

7 (7.7)

9 (12.5)

0.63 [0.26, 1.52]

Gestational age at birth (mean, SD)b

Trial as a whole (1163; 777)

38.9 (1.5)

38.7 (1.8)

0.15 [0.00, 0.30]

Germany (457; 280)

38.9 (1.4)

39.0 (1.8)

−0.10 [−0.35, 0.15]

Ireland (358; 249)

39.1 (1.5)

39.0 (1.7)

0.10 [−0.16, 0.36]

Italy (348; 248)

38.6 (1.7)

38.1 (1.6)

0.50 [0.23, 0.77]

Vaginal birth before previous CS (104; 54)

38.7 (1.9)

38.4 (2.0)

0.30 [−0.35, 0.95]

No vaginal births before previous CS (1059; 723)

38.9 (1.5)

38.7 (1.7)

0.20 [0.05, 0.35]

Prior VBAC (74; 32)

39.0 (1.5)

39.4 (1.4)

−0.40 [−0.99, 0.19]

No prior VBAC (1089; 745)

38.9 (1.6)

38.7 (1.8)

0.20 [0.04, 0.36]

Recruitment at < 30 weeks (619; 461)

38.7 (1.7)

38.7 (1.8)

0.00 [−0.21, 0.21]

Recruitment at 30–32 weeks (104; 44)

38.7 (1.5)

38.3 (1.9)

0.40 [−0.23, 1.03]

Recruitment at ≥33 weeks (438; 270)

39.1 (1.3)

38.9 (1.5)

0.20 [−0.02, 0.42]

BMI (< 25.00) (553; 309)

38.9 (1.5)

38.8 (1.7)

0.10 [−0.13, 0.33]

BMI (25–29.99) (347; 268)

38.9 (1.6)

38.7 (1.7)

0.20 [−0.06, 0.46]

BMI (> 29.99) (202; 175)

38.8 (1.5)

38.5 (1.9)

0.30 [−0.05, 0.65]

Age (< 40 years) (1072; 702)

38.9 (1.6)

38.8 (1.7)

0.10 [−0.06, 0.26]

Age (≥40 years) (91; 72)

38.6 (1.5)

38.3 (1.8)

0.30 [−0.22, 0.82]

Admission to NICU (% of live-born)c

Trial as a whole (1163; 777)

90 (7.7)

63 (8.1)

0.87 [0.64, 1.17]

Germany (457; 280)

34 (7.4)

28 (10.0)

0.58 [0.35, 0.95]

Ireland (358; 249)

40 (11.2)

28 (11.2)

0.97 [0.62, 1.51]

Italy (348; 248)

16 (4.6)

7 (2.8)

1.70 [0.73, 3.93]

Vaginal birth before previous CS (104; 54)

11 (10.6)

6 (11.1)

0.97 [0.43, 2.21]

No vaginal births before previous CS (1059; 723)

79 (7.5)

57 (7.9)

0.85 [0.62, 1.18]

Prior VBAC (74; 32)

8 (10.8)

4 (12.5)

0.93 [0.34, 2.58]

No prior VBAC (1089; 745)

82 (7.5)

59 (7.9)

0.87 [0.64, 1.20]

Recruitment at < 30 weeks (619; 462)

60 (9.7)

40 (8.7)

1.08 [0.74, 1.58]

Recruitment at 30–32 weeks (104; 44)

6 (5.8)

4 (9.1)

0.68 [0.22, 2.11]

Recruitment at ≥33 weeks (438; 270)

23 (5.3)

19 (7.0)

0.63 [0.36, 1.11]

BMI (< 25.00) (553; 309)

40 (7.2)

25 (8.1)

0.91 [0.56, 1.48]

BMI (25–29.99) (347; 268)

29 (8.4)

16 (6.0)

0.96 [0.54, 1.70]

BMI (> 29.99) (202; 175)

17 (8.4)

21 (12.0)

0.56 [0.31, 1.01]

Age (< 40 years) (1072; 702)

86 (8.0)

60 (8.5)

0.87 [0.64, 1.19]

Age (≥40 years) (91; 72)

4 (4.4)

3 (4.2)

0.72 [0.17, 2.99]

  1. a. Among infants who were live-born before 37 weeks gestation: gestational age at baseline is missing for 1 mother (control), BMI at baseline is missing for 4 mothers (intervention: 4; control: 0), age at baseline is missing for 1 mother (control)
  2. b. Among infants who were live-born with gestational age at birth available: gestational age at baseline is missing for 4 mothers (intervention: 2; control: 2), BMI at baseline is missing for 57 mothers (intervention: 57; control: 20)
  3. c. Among infants who were admitted to NICU: gestational age at baseline is missing for 1 mother (intervention), BMI at baseline is missing for 5 mothers (intervention: 4; control: 1)