Table 4

Demographic and pregnancy, labour and delivery characteristics of all cases, using the midwives’ records
HMDS only Any PBS HMDS only
(N = 2111) (N = 4485) vs any PBS
N SD N SD t-test
Mean maternal age, yrs 29.0 6.1 30.1 5.8 <0.0001
Mean maternal height, cm 164.7 7.1 165.1 6.8 0.0244
Mean gestation, wks 37.7 3.3 38.2 2.3 <0.0001
Mean SEIFA 970.4 99.8 985.1 87.7 <0.0001
N % N % OR (95% CI)
Caucasian 1656 78.4 4217 94.0 0.23 (0.19-0.27)
Smoked during pregnancy 743 35.2 1312 29.3 1.32 (118–1.47)
Parity > 1 1584 75.0 3556 79.3 0.79 (0.70-0.89)
Singleton 2056 97.4 4410 98.3 0.64 (0.45-0.90)
Pregnancy characteristics
Preeclampsia 180 8.5 245 5.5 1.61 (1.32-1.97)
Gestational diabetes 97 4.6 210 4.7 0.98 (0.77-1.25)
Essential hypertension 25 1.2 69 1.5 0.77 (0.48-1.22)
Pre-existing diabetes 28 1.3 38 0.8 1.57 (0.96-2.57)
Other medical condition 1189 56.3 2251 50.2 0.78 (0.70-0.87)
CTG ante-partum 972 46.0 1615 36.0 0.66 (0.59-0.73)
CTG intra-partum 1024 48.5 1735 38.7 0.67 (0.60-0.74)
Labour and delivery characteristics
preterm 401 19.0 548 12.2 1.69 (1.46-1.94)
Induced labour 681 32.3 1307 29.1 1.16 (1.04-1.30)
Delivered by an obstetrician 552 26.1 1639 36.5 0.61 (0.55-0.69)
Precipitate delivery 93 4.4 273 6.1 0.71 (0.56-0.91)
Local anaesthetic to perineum 58 2.7 236 5.3 0.51 (0.38-0.68)
Elective Caesarean delivery 337 16.0 857 19.1 0.80 (0.70-0.92)
Emergency Caesarean delivery 408 19.3 663 14.8 1.38 (1.21-1.58)
Fetal distress 408 19.3 705 15.7 1.28 (1.12-1.47)
PPH (> = 500 mls) 468 22.2 508 11.3 2.23 (1.94-2.56)
Pre-labour rupture of membranes 193 9.1 260 5.8 1.64 (1.32-1.99)

Colvin et al.

Colvin et al. BMC Pregnancy and Childbirth 2013 13:63   doi:10.1186/1471-2393-13-63

Open Data