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Distribution of ages at which subjects were scanned
| Ages at scans (years) | Singletons | Twin subjects | Total |
|---|---|---|---|
| 0 and 1 | 26 (10 males) | 25 (15 males) | 51 (25 males) |
| 0 and 2 | 4 (3 males) | 10 (4 males) | 14 (7 males) |
| 1 and 2 | 15 (11 males) | 16 (10 males) | 31 (21 males) |
| 0, 1, and 2 | 20 (11 males) | 27 (13 males) | 47 (24 males) |
| Total | 65 (35 males) | 78 (42 males) | 143 (77 males) |
