Table III.
Comparisons of Demographic Factors, ADHD Subtypes, Symptom Scores, and Other Psychiatric Comorbidities Including Only Subjects With IQ ≥ 70
| 22q11.2DS ADHD (n = 32) | Clinical ADHD (n = 473) | |||
|---|---|---|---|---|
| Variable | Mean (SD) or % | Mean (SD) or % | χ2, t, z | P |
| Age | 9.22 (1.69) | 10.69 (2.89) | t = 2.86 | 0.004 |
| Sex (% males) | 59% | 84% | χ2 = 13.12 | <0.001 |
| IQ | 82.69 (9.62) | 85.88 (10.40) | t = 1.69 | 0.09 |
| ADHD comparisons | ||||
| Inattentive subtype | 56% | 9% | χ2 = 68.03 | <0.001 |
| Hyperactive–Impulsive subtype | 9% | 10% | ||
| Combined subtype | 34% | 81% | ||
| ADHD symptoms —inattention | 7.29 (1.24) | 7.60 (1.56) | z = 1.85 | 0.07 |
| ADHD symptoms—hyperactivity–impulsivity | 4.61 (2.62) | 7.73 (1.54) | z = 6.77 | <0.001 |
| ADHD symptoms—total | 11.90 (3.02) | 15.33 (2.38) | z = 5.85 | <0.001 |
| Other psychopathology | ||||
| Oppositional defiant disorder | 31% | 48% | χ2 = 3.28 | 0.07 |
| Conduct disorder | 0% | 19% | χ2 = 7.16 | 0.01 |
| Generalized anxiety disorder | 13% | 3% | χ2 = 6.42 | 0.01 |
| Separation anxiety disorder | 13% | 3% | χ2 = 3.90 | 0.05 |
| Major depressive disorder | 0% | 1% | χ2 = 0.35 | 0.55 |
| Tic disorder | 13% | 11% | χ2 = 0.11 | 0.74 |
| ODD/CD symptoms | 4.07 (1.65) | 6.60 (2.81)6.60 (2.81) | z = 5.15 | <0.001 |
| Worries symptoms | 1.87 (1.80) | 0.97 (1.44) | z = −3.02 | 0.003 |
| Depression symptoms | 0.70 (1.18) | 0.46 (0.89) | z = −1.24 | 0.22 |
| Sleep symptoms | 1.42 (1.43) | 1.17 (1.12) | z = −0.61 | 0.54 |
ADHD, attention‐deficit/hyperactivity disorder; ODD, oppositional defiant disorder; CD, conduct disorder.
The bold values signify a P‐value ≤0.05.