Maternal and neonatal characteristics in relation to time of operative vaginal delivery
| Daytime 08:00–19:59 n=301 (%) | Night-time 20:00–07:59 n=296 (%) | OR (95% CI) | |
|---|---|---|---|
| Maternal | |||
| Maternal age >35 years | 33 (11.0) | 32 (10.8) | 1.02 (0.61 to 1.70) |
| BMI† ≥30.0 | 25 (8.3) | 26 (8.8) | 0.94 (0.53 to 1.67) |
| Caucasian | 274 (91.0) | 270 (91.2) | 0.98 (0.56 to 1.72) |
| Diabetes (type 1/2 or gestational) | 15 (5.0) | 12 (4.1) | 1.24 (0.57 to 2.70) |
| Pre-eclampsia | 4 (1.3) | 13 (4.4) | 0.29 (0.09 to 0.91)† |
| Cigarette smoker | 17 (5.6) | 14 (4.7) | 1.21 (0.58 to 2.49) |
| Alcohol in pregnancy | 4 (1.3) | 2 (0.7) | 1.98 (0.36 to 10.89) |
| Illicit drug use | 3 (1.0) | 1 (0.3) | 2.97 (0.31 to 28.7) |
| Private patient | 45 (15.0) | 46 (15.5) | 0.96 (0.61 to 1.49) |
| Neonatal | |||
| Gender male | 155 (51.5) | 157 (53.0) | 0.94 (0.68 to 1.30) |
| Head circumference ≥37.0 cm | 30 (10.0) | 32 (10.8) | 0.91 (0.54 to 1.55) |
| Birth weight ≥4.0 kg | 47 (15.6) | 42 (14.2) | 1.12 (0.71 to 1.76) |
| Birth weight <2.5 kg | 11 (3.7) | 2 (0.7) | 5.58 (1.23 to 25.38)* |
*p<0.05.
†BMI, body mass index measured as booking weight divided by the square of height (kg/m2).