Table 6.
Characteristics at birth of siblings and minor extended family members based on available parent-administered questionnaires
| Minor extended | ||
|---|---|---|
| Siblings | family members | |
| n | 8917 | 352 |
| Sex, n (%) | ||
| Boys | 4577 (51.3) | 185 (52.6) |
| Girls | 4326 (48.5) | 165 (46.9) |
| Missing | 14 (0.2) | 2 (0.6) |
| Delivery week, n (%) | ||
| Preterm (<37 w） | 412 (4.6) | 21 (6.0) |
| Normal term (37 w-<42 w） | 8334 (93.5) | 314 (89.2) |
| Postmature (≥42 w) | 69 (0.8) | 1 (0.3) |
| Missing or out of range (<22 w or ≥45 w) | 102 (1.1) | 16 (4.5) |
| Birthweight, n (%) | ||
| ≥2500 g | 8141 (91.3) | 306 (86.9) |
| <2500 g | 616 (6.9) | 35 (9.9) |
| Missing or out of range (≤mean -3SD or ≥mean +3SD) | 160 (1.8) | 11 (3.1) |
| Birthweight (g), mean (SD)a | 3054.2 (384.9) | 3018.2 (382.7) |
w, weeks.
a
Values of ≤mean -3SD or ≥mean +3SD are deleted.