| Recruited (n = 365) | Not recruited (n = 244) | P |
---|---|---|---|
Age, years | 30.9 (4.1) | 31.6 (4.2) | 0.05 |
Booking BMI, kg/m2 | 23.7 (21.5–26.9) | 23.5 (21.5–26.2) | 0.26 |
Smoking status | |||
 Current smoker  Ex-smoker  Never | 7 (1.9%) 95 (26.1%) 262 (72.0%) | 7 (2.9%) 51 (20.9%) 186 (76.2%) | 0.28 |
Gestational hypertension or pre-eclampsia | 53 (14.6%) | 42 (17.3%) | 0.37 |
GDM | 47 (12.9%) | 26 (10.7%) | 0.45 |
Onset of delivery | |||
 Induction of labour  Spontaneous labour  No labour | 177 (48.6%) 155 (42.6%) 32 (8.8%) | 104 (42.8%) 117 (48.1%) 22 (9.1%) | 0.35 |
Mode of delivery | |||
 Normal vaginal delivery  Instrumental delivery  Emergency caesarean  Elective caesarean | 137 (37.6%) 118 (32.4%) 80 (22.0%) 29 (8.0%) | 90 (37.0%) 76 (31.3%) 58 (23.9%) 19 (7.8%) | 0.96 |
Birthweight, g | 3331 (514.5) | 3308 (526.0) | 0.87 |
Birthweight centile | 39.0 (18.1–69.6) | 40.6 (20.8–64.9) | 0.83 |
SGA, < 10th centile | 45 (12.4%)a | 28 (11.5%) | 0.80 |
Severe SGA, < 3rd centile | 13 (3.6%)a | 9 (3.7%) | 1.00 |
Gestational age at delivery, weeks | 39.7 (38.7–40.6) | 39.7 (38.7–40.6) | 0.80 |