Table 1 Participant characteristics
| Â | Participants with at least one metabolic profile analysed (analysis sample) n = 1158a | All eligible participants in the six contributing centres n = 1194a | ||
|---|---|---|---|---|
Control n = 577 | Intervention n = 581 | Control n = 593 | Intervention n = 601 | |
BMI, n (%) | ||||
 30–34.9 kg/m2 | 273 (47.3) | 287 (49.4) | 279 (47) | 296 (49.3) |
 35–39.9 kg/m2 | 203 (35.2) | 177 (30.5) | 209 (35.2) | 185 (30.8) |
 ≥ 40 kg/m2 | 101 (17.5) | 117 (20.1) | 105 (17.7) | 120 (20) |
Ethnicity, n (%) | ||||
 White | 389 (67.4) | 384 (66.1) | 396 (66.8) | 397 (66.1) |
 Asian | 38 (6.6) | 43 (7.4) | 43 (7.3) | 45 (7.5) |
 Black | 120 (20.8) | 127 (21.9) | 123 (20.7) | 130 (21.6) |
 Other | 30 (5.2) | 27 (4.6) | 31 (5.2) | 29 (4.8) |
Parity, n (%) | ||||
 Primiparous | 260 (45.1) | 257 (44.2) | 266 (44.9) | 265 (44.1) |
 Multiparous | 317 (54.9) | 324 (55.8) | 327 (55.1) | 336 (55.9) |
Age, n (%) | ||||
 < 25 years | 97 (16.8) | 85 (14.6) | 100 (16.9) | 90 (15) |
 25–29 years | 141 (24.4) | 165 (28.4) | 147 (24.8) | 169 (28.1) |
 30–34 years | 187 (32.4) | 174 (29.9) | 188 (31.7) | 182 (30.3) |
 ≥ 35 years | 152 (26.3) | 157 (27) | 158 (26.6) | 160 (26.6) |
Gestational diabetes, n (%) | ||||
 Yes | 146 (25.3) | 137 (23.6) | 148 (25.0) | 137 (22.8) |
 No | 366 (63.4) | 344 (59.2) | 370 (62.4) | 351 (58.4) |
 Missing | 65 (11.3) | 100 (17.2) | 75 (12.6) | 113 (18.8) |
Centre, n (%) | ||||
 Bradford | 19 (3.3) | 22 (3.8) | 25 (4.2) | 28 (4.7) |
 Glasgow | 130 (22.5) | 132 (22.7) | 131 (22.1) | 134 (22.3) |
 Manchester | 67 (11.6) | 67 (11.5) | 70 (11.8) | 69 (11.5) |
 Newcastle | 120 (20.8) | 116 (20) | 122 (20.6) | 120 (20) |
 St George’s, London | 53 (9.2) | 55 (9.5) | 54 (9.1) | 57 (9.5) |
 St Thomas’s, London | 188 (32.6) | 189 (32.5) | 191 (32.2) | 193 (32.1) |
First clinic visit | ||||
 n (%) | 538 (93.2) | 545 (93.8) | 593 (100.0) | 601 (100.0) |
 Median (IQR) gestation, weeks | 17.0 (16.1–17.9) | 17.0 (16.1–18.0) | 17.0 (16.1–17.9) | 17.0 (16.1–18.0) |
Second clinic visit | ||||
 n (%) | 500 (86.7) | 477 (82.1) | 591 (99.7) | 598 (99.5) |
 Median (IQR) gestation, weeks | 27.7 (27.3–28.1) | 27.7 (27.3–28.1) | 27.7 (27.3–28.3) | 27.7 (27.3–28.1) |
Third clinic visit | ||||
 n (%) | 407 (70.5) | 374 (64.4) | 524 (88.4) | 485 (80.7) |
 Median (IQR) gestation, weeks | 34.7 (34.3–35.1) | 34.6 (34.3–35.1) | 34.7 (34.3–35.3) | 34.7 (34.3–35.3) |