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Sociodemographics at baseline of the sample (n = 52)
| Age at baseline (years) | 15.4 ± 1.5 |
| Age at follow-up (years) | 17.5 ± 1.6 |
| Interscan interval (years) | 2.1 ± 0.3 |
| Age range (years) | 11–17 |
| Sex, n (% male) | 32 (61.5) |
| Handedness, n (% right) | 44 (84.6) |
| Parental education (years) | 14.1 ± 4.1 |
| Parental socioeconomic status (1/2/3/4/5), n | 6/16/15/3/12 |
| Estimated IQ | 108 ± 17.6 |
| IQ range | 73–141 |
| Ethiticity (Hispanic/white/other) | 3/48/1 |
