Table 1 Patient characteristics

Maternal Age

29.2 ± 5.0

Primiparous

269

49.5

Multiparous

274

50.5

Mean gestational age at examination [Weeks ± SD in days]

37 + 3/7 (262 d) ± 6.8d

Mean gestational age at time of delivery [weeks ± SD in days]

39 + 2/7 (275 d) ± 8d

Mean actual birth weight [g]

3382.9 ± 400.2

Median time estimation to birth [in days ± SD]

15.6 ± 8

 Spontaneous vaginal delivery

342

63.0

 Operative vaginal delivery

45

8.3

 Caesarean section

156 (100%)

28.7

  Planned/Primary

57 (36.5%)

10.5

  Unplanned/Secondary (including failed induction of labour)

99 (63.5%)

18.2

Mean maternal BMI [kg/m²]

23.9 ± 4.8

 BMI < 25

379

69.8

 BMI 25–99

164

30.2

Spontaneous onset of labour

429

79.0

Induced onset of labour

114

21.0

Gestational diabetes

29

5.3

Pre-existing diabetes

2

0.4

Chronic or gestational hypertension

9

1.7

Preeclampsia

13

2.4