Table 1.
Demographics
| Wave 1 | Wave 2 | Wave 3 | |
|---|---|---|---|
| N (MZ/DZ/sibs) | 285 (90/115/80) | 179 (61/67/51) | 235 (71/97/67) |
| Age (range) | 10.0 [9.0–15.0] | 13.0 [9.8–17.9] | 18.0 [14.9–22.9] |
| IQ (sd) | 101.9 (14.7) | 101.7 (15.3) | 103.8 (12.7) |
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