| Whole group | Control | Intervention |
---|---|---|---|
(n = 1023) | (n = 504) | (n = 519) | |
Age (years) | 30.5 (5.5) | 30.5 (5.7) | 30.4 (5.3) |
Ethnicity | |||
 White | 652 (64%) | 322 (64%) | 330 (64%) |
 Black | 236 (23%) | 115 (23%) | 121 (23%) |
 Asian | 79 (8%) | 40 (8%) | 39 (8%) |
 Other | 56 (5%) | 27 (5%) | 29 (6%) |
BMI (kg/m2)a | 36.2(4.7) | 36.2 (4.6) | 36.2 (4.9) |
Parity | |||
 Nulliparous | 440 (43%) | 220 (44%) | 220 (42%) |
 Multiparous | 583 (57%) | 284 (56%) | 299 (58%) |
Educationb | |||
 None/GCSE | 203 (20%) | 103 (20%) | 100 (19%) |
 A level | 165 (16%) | 82 (16%) | 83 (16%) |
 Degree/higher degree | 408 (40%) | 197 (39%) | 211 (41%) |
 Vocational qualification | 247 (24%) | 122 (24%) | 125 (24%) |
Index of multiple deprivationc | |||
 1 (least deprived) | 43 (4%) | 26 (5%) | 17 (3%) |
 2 | 74 (7%) | 32 (6%) | 42 (8%) |
 3 | 124 (12%) | 53 (11%) | 71 (14%) |
 4 | 345 (34%) | 192 (38%) | 153 (30%) |
 5 (most deprived) | 436 (43%) | 201 (40%) | 235 (45%) |