Table 1 Demographic and clinical characteristics at trial entry (baseline)

Maternal age, years^b

29.3 ± 5.4

29.6 ± 5.6

29.4 ± 5.5

Gestational age at entry, weeks^c

14.0 (11.9 to 17.0)

14.1 (11.9 to 17.0)

14.1 (11.9 to 17.0)

Body mass index, kg/m^2c

31.0 (28.1 to 35.9)

31.1 (27.7 to 35.6)

31.1 (27.9 to 35.8)

Body mass index category^d

 25.0 to 29.9

458 (41.4)

468 (42.7)

926 (42.1)

 30.0 to 34.9

326 (29.5)

318 (29.0)

644 (29.2)

 35.0 to 39.9

202 (18.3)

183 (16.7)

385 (17.5)

 ≥40.0

119 (10.8)

128 (11.7)

247 (11.2)

Public patient^c

1081 (97.8)

1067 (97.3)

2148 (97.5)

Weight, kg^b

88.6 ± 17.3

88.2 ± 17.6

88.4 ± 17.4

Height, cm^b

164.9 ± 16.6

164.8 ± 16.5

164.8 ± 16.6

Race^c

 Caucasian

995 (90.0)

998 (91.0)

1993 (90.5)

 Asian

26 (2.4)

34 (3.1)

60 (2.7)

 Indian

40 (3.6)

35 (3.2)

75 (3.4)

 Other

44 (4.0)

30 (2.7)

74 (3.4)

Smoker^c

154 (13.9)

126 (11.5)

280 (12.7)

Nulliparous^c

457 (41.4)

441 (40.2)

898 (40.8)

Previous preterm birth^c

57 (5.2)

59 (5.4)

116 (5.3)

Previous pre-eclampsia^c

46 (4.2)

51 (4.6)

97 (4.4)

Previous stillbirth^c

13 (1.2)

6 (0.5)

19 (0.9)

Previous neonatal death^c

11 (1.0)

7 (0.6)

18 (0.8)

Previous caesarean section^c

197 (17.8)

214 (19.5)

411 (18.7)

Family history of diabetes^c

288 (26.1)

290 (26.4)

578 (26.2)

Family history of hypertension^c

389 (35.2)

369 (33.6)

758 (34.4)

Family history of heart disease^c

187 (16.9)

179 (16.3)

366 (16.6)

Index of socio-economic disadvantage^e

 Unknown

2 (0.2)

1 (0.1)

3 (0.1)

 Quintile 1, (most disadvantaged)

340 (30.8)

321 (29.3)

661 (30.0)

 Quintile 2

271 (24.5)

264 (24.1)

535 (24.3)

 Quintile 3

173 (15.7)

174 (15.9)

347 (15.8)

 Quintile 4

150 (13.6)

178 (16.2)

328 (14.9)

 Quintile 5, (least disadvantaged)

169 (15.3)

159 (14.5)

328 (14.9)