Loss to follow-up at 21 years according to mother and child characteristics
| No | Remaining at the 21-year follow-up | ||
| No (row %) | |||
| Self-report | Physical assessment | ||
| Children’s gender | |||
| Male | 3757 | 1784 (47.5) | 1293 (34.4) |
| Female | 3465 | 1964 (56.7)* | 1319 (38.1)** |
| Mother’s age at pregnancy | |||
| <20 years | 1181 | 491 (41.6) | 358 (30.3) |
| 20–34 years | 5722 | 3083 (53.9) | 2128 (37.2) |
| ≥35 years | 319 | 174 (54.6)* | 126 (39.5)* |
| Mother’s education at pregnancy | |||
| Incomplete high school | 1305 | 742 (59.1) | 514 (36.2) |
| Complete high school | 4608 | 2390 (51.9) | 1665 (36.1) |
| Tertiary education | 1256 | 591 (45.3)* | 416 (40.9)* |
| Maternal smoking during pregnancy | |||
| No | 4394 | 2442 (55.6) | 1665 (37.9) |
| Yes | 2757 | 1269 (46.0)* | 922 (33.4)* |
*p<0.001; **p<0.01