Table 1 Demographic and reproductive characteristics, n = 2849
Characteristics | n (%) |
|---|---|
Maternal age (years) | |
< 30 | 1811 (63.6) |
30–34 | 845 (29.7) |
≥ 35 | 193 (6.8) |
Pre-pregnancy BMIa(kg/m2) | |
< 18.5 | 435 (15.3) |
18.5–24.9 | 2119 (74.4) |
≥ 25 | 295 (10.4) |
Parental educational level (years) | |
≤ 12 | 142 (5.0) |
> 12 | 2707 (95.0) |
Smoking status in early pregnancy | |
No | 2831 (99.4) |
Yes | 9 (0.3) |
Unknown | 9 (0.3) |
Parity | |
0 | 2435 (85.5) |
≥ 1 | 414 (14.5) |
Pregnancy complicated by chronic diseasesa | |
No | 2653 (93.1) |
Yes | 196 (6.9) |
Infant sex | |
Male | 1456 (51.1) |
Female | 1393 (48.9) |
Gestational age at blood drawn (weeks) | |
Median (IQR) | 15 (13–16) |