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Table 1 Baseline characteristics of all women recruited to the trial

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

Characteristic

Maternity unit or country (number of recruited women)

Intervention sites

Control sites

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

Number recruited

Trial as a whole

1195

807

 

Germany

466

289

Ireland

368

254

Italy

361

264

Any prior vaginal birth (before previous CS)

Trial as a whole

104 (8.7%)

54 (6.7%)

1.30 [0.92, 1.83]

Germany

28 (6.0%)

16 (5.5%)

0.91 [0.48, 1.74]

Ireland

58 (15.8%)

30 (11.8%)

1.37 [0.86, 2.18]

Italy

18 (5.0%)

8 (3.0%)

1.94 [0.83, 4.56]

Any prior VBAC

Trial as a whole

75 (6.3%)

32 (4.0%)

1.52 [0.99, 2.33]

Germany

26 (5.6%)

18 (6.2%)

0.91 [0.48, 1.71]

Ireland

32 (8.7%)

13 (5.1%)

1.56 [0.80, 3.06]

Italy

17 (4.7%)

1 (0.4%)

8.94 [1.62, 49.27]

Gestational age at recruitment (mean, weeks)a

Trial as a whole

26.3 (9.4)

24.8 (10.5)

1.15 [0.42, 1.88]

Germany

32.7 (5.6)

28.3 (11.4)

4.40 [2.99, 5.81]

Ireland

19.6 (7.3)

19.1 (5.3)

0.50 [−0.49, 1.49]

Italy

24.8 (9.8)

26.4 (11.1)

−1.60 [−3.28, 0.08]

BMI at recruitment (mean)b

Trial as a whole

25.8 (5.1)

27.0 (5.5)

−1.26 [− 1.73, −0.79]

Germany

25.6 (5.5)

26.2 (5.3)

−0.60 [−1.39, 0.19]

Ireland

26.6 (4.9)

27.2 (5.8)

−0.60 [−1.47, 0.27]

Italy

25.2 (4.8)

27.7 (5.2)

−2.50 [−3.30, −1.70]

Age at recruitment (mean, years)c

Trial as a whole

34.0 (4.5)

34.2 (4.7)

−0.27 [− 0.67, 0.14]

Germany

34.1 (4.3)

33.8 (4.7)

0.30 [−0.37, 0.97]

Ireland

33.0 (4.2)

33.5 (4.4)

−0.50 [−1.19, 0.19]

Italy

34.8 (4.8)

35.5 (4.6)

−0.70 [−1.44, 0.04]

  1. a. Gestational age at baseline is missing for 4 women (intervention: 2; control: 2)
  2. b. BMI at baseline is missing for 139 women (intervention: 86; control: 53)
  3. c. Age at baseline is missing for 4 women (intervention: 0; control: 4)