Detailed demographic information of subjects included in this study
| n | Sex (males/females) | Age (postnatal days) | |
|---|---|---|---|
| 1 month | 178 | 129/85 | 37 ± 18 |
| Singletons | 36 | 17/19 | 22 ± 9 |
| Dizygotic twins | 80 | 46/34 | 36 ± 15 |
| Monozygotic twins | 62 | 30/32 | 46 ± 16 |
| 12 months | 132 | 87/59 | 397 ± 26 |
| Singletons | 46 | 23/23 | 378 ± 17 |
| Dizygotic twins | 50 | 31/19 | 402 ± 28 |
| Monozygotic twins | 36 | 16/20 | 410 ± 17 |
| 24 months | 100 | 58/41 | 765 ± 32 |
| Singletons | 26 | 17/9 | 741 ± 25 |
| Dizygotic twins | 38 | 25/13 | 779 ± 35 |
| Monozygotic twins | 36 | 16/20 | 766 ± 23 |