Table 2.
Sample characteristics.
| Variable | All n = 159,215 |
≥ 37 weeks n = 150,257 |
> 34 to < 37 weeks n = 7,315 |
≤ 34 weeks n = 1,643 |
|---|---|---|---|---|
| Sex | ||||
| Male, n (%) | 80,838 (50·7) | 76,123 (50·7) | 3,852 (52·7) | 863 (52·5) |
| Female, n (%) | 78,377 (49·2) | 74,134 (49·3) | 3,463 (47·3) | 780 (47·5) |
| Gestational age, weeks mean (min-max) |
39·3 (22·3–43·9) |
39·5 (37·0–43·9) |
36·0 (34·1–36·9) |
31·3 (22·3–34·0) |
| Birth weight mean (min–max) |
3374 (500–6210) |
3426 (743–6210) |
2682 (830–5605) |
1736 (500–4500) |
| Small for gestational age, n (%) | 15,845 (9·95) | 14,005 (9·3) | 796 (10·9) | 139 (8·5) |
| Multiple births, n (%) | 4412 (2·8) | 2399 (1·60) | 1491 (20·4) | 522 (31·8) |
| Hb(F + F1)/Hb(A + F + F1) mean (min–max) |
0·82 (0·05–1·00) |
0·82 (0·05–1·00) |
0·89 (0·11–0·97) |
0·92 (0·40–0·98) |