Measure | TD ( n  = 21) | ARND ( n  = 22) | ADHD ( n  = 19) | Significance a | Post hoc tests | |||
---|---|---|---|---|---|---|---|---|
Mean | Std dev | Mean | Std dev | Mean | Std dev | |||
Age (years) | 12.60 | 1.29 | 12.20 | 1.64 | 11.93 | 1.33 | F = 1.098, p = 0.340 |  |
Sex (% male) | 76.2 |  | 63.6 |  | 89.5 |  | χ 2 = 3.713, p = 0.156 |  |
Household income ($) | 70,842 | 15,302 | 49,733 | 21,118 | 65,287 | 27,879 | F = 5.261, p = 0.008 | TD > ARND, p = 0.007b |
Full-scale IQ | 107.81 | 13.08 | 73.05 | 12.33 | 95.79 | 16.97 | F = 32.527, p < 0.001 | TD > ARND, p < 0.001c |
 |  |  |  |  |  |  |  | ADHD > ARND, p < 0.001c |