Table 1.
Sociodemographic characteristics of women in the different BMI groups
| Characteristics | Underweight BMI < 20 n = 2842 |
Normal BMI = 20–24.9 n = 14076 |
Overweight BMI = 25–29.9 n = 5308 |
Obese BMI = 30–34.9 n = 1858 |
Morbidly Obese BMI > 35 n = 157 |
| Age at delivery (years) | 24.8 (5.2)* | 26.4(5.2) | 26.8(5.2) | 26.8(5.1) | 28.3(5.3)* |
| Height (cm) | 163.0(6.5) | 162.5(6.3) | 162.2(6.4) | 162.2(6.4) | 162.4(6.0) |
| Weight (Kg) | 50.1(4.6) | 59.2(5.7) | 70.9(6.7) | 87.3(9.5) | 114.1(11.2) |
| BMI (Kg/m2) | 18.8 (0.9) | 22.4(1.3) | 26.9(1.4) | 33.2(2.5) | 43.3(3.7) |
| Booking week | 10.7(2.6) | 10.8(2.6) | 10.6(2.7) | 10.2(2.7) | 9.7(2.8) |
| Married or cohabiting | 2201(77.4%)* | 11848(84.2%) | 4449(83.8%) | 1522(81.9%) | 125(79.6%)* |
| Husband/partner's social class I/II | 662(23.3%)* | 3771(26.8%) | 1227(23.1%)* | 358(19.3%)* | 24(15.3%)* |
| Smoking | 1208(42.5%)* | 4832(34.3%) | 1691(31.9%)* | 568(30.6%)* | 32(20.4%)* |
| Type I Diabetes | 0(0%) | 27(0.2%) | 40(0.8%)* | 5 (0.3%) | 3(1.9%)* |
Values expressed as mean (SD) median (IQR) or number (per cent)
* P value less than 0.05