Table 1.
Means (M) and standard deviations (SD) of IQ scores, age in months, and EDAH percentile scores of the two groups in the sample (Control and ADHD group).
| Control group | ADHD group | Total sample | |||
|---|---|---|---|---|---|
| N | 243 | 256 | 499 | ||
| IQ M (SD) | 98.30 (10.28) | 98.95 (10.15) | 98.64 (10.21) | F(1,497) = 0.496, p = 0.481, η2 = 0.001 | |
| Age (months) M (SD) | 136.67 (17.51) | 132.88 (16.77) | 134.72 (17.22) | F(1,497) = 6.102, p = 0.014, η2 = 0.012 | |
| Sex (male/female) | 146/97 | 178/78 | 324/175 | χ2 (1) = 4.888, p = 0.027 | |
| EDAH scores | ADHD-I | 73.84 (10.71) | 90.96 (5.44) | 82.62 (12.01) | F(1,497) = 514.33, p = 0.000, η2 = 0.509 |
| ADHD-HI | 74.49 (10.59) | 92.05 (5.20) | 83.50 (12.06) | F(1,497) = 561.34, p = 0.000, η2 = 0.530 | |
| ADHD-C | 75.77 (9.90) | 91.46 (6.17) | 83.82 (11.34) | F(1,497) = 456.27, p = 0.000, η2 = 0.479 | |
(ADHD-I) subtype with predominance of attention deficit; (ADHD-HI) subtype with predominance of hyperactivity–impulsivity; and (ADHD-C) combined subtype, with predominance both of inattention and hyperactivity-impulsivity.