Table 2.
Prevalence (%) of disruptive disorders and degree of mental retardation in both groups.
| Non Down (100) | Down (100) | χ2 | P | |
|---|---|---|---|---|
|
| ||||
| ADHD | 8.0 | 56.0 | 52.9 | ≤.001 |
| ADHD--impulsive | 6.0 | 34.0 | 24.5 | ≤.001 |
| ADHD-inattentive | 4.0 | 38.0 | 34.8 | ≤.001 |
| ADHD-combined | 2.0 | 16.0 | 11.97 | ≤.001 |
| Oppositional defiant | 14.0 | 8.0 | 1.8 | .18 |
| Conduct disorders | 10.0 | 4.0 | 2.8 | .1 |
| IQ categories | ≤.001 * | |||
| Normal | 100.0 | 0 | ||
| Below average | 0 | 2.0 | ||
| Borderlines | 0 | 8.0 | ||
| Mild MR | 0 | 36.0 | ||
| Moderate MR | 0 | 48.0 | ||
| Severe MR | 0 | 6.0 | ||
ADHD: Attention deficit/hyperactive disorder; IQ: intelligence quotient; MR: mental retardation.
*
Monte Carlo test