Mean (SD) age, y | 29.2 (5.4) | 28.3 (5.3) | 29.5 (5.1) |
Age range, y | 17–41 | 16–40 | 19–41 |
Mean (SD) BMI, kg/m2 | 22.0 (1.7) | 26.9 (1.3) | 35.8 (4.5) |
Nulliparous, % | 50.0 | 44.4 | 45.8 |
Non-smokers, % | 89.3 | 86.4 | 84.7 |
Mean (SD) weight gain at term, kg | 16.1 (4.6)* | 15.8 (6.6)† | 11.4 (6.8)‡ |