Table VI.
Comparisons of Demographic Factors, ADHD Subtypes, Scores, and Other Psychiatric Comorbidities Between the 22q11.2DS and the Population‐Based Sample
| Variable | 22q11.2DS ADHD (n = 44) | Population‐based sample (n = 77) | χ2, z, t | P |
|---|---|---|---|---|
| Mean (SD) or % | Mean (SD) or % | |||
| Age | 9.61 (2.07) | 10.80 (0.21) | t = 5.00 | <0.001 |
| Sex | 59% | 88% | χ2 = 13.79 | <0.001 |
| IQ | 78.17 (12.42) | 99.25 (20.70) | t = 5.77 | <0.001 |
| ADHD comparisons | ||||
| Inattentive subtype | 61% | 26% | χ2 = 114.87 | <0.001 |
| Hyperactive–impulsive subtype | 9% | 14% | ||
| Combined subtype | 30% | 60% | ||
| ADHD symptoms—inattention | 7.40 (1.20) | 7.20 (2.01) | z = 0.37 | 0.71 |
| ADHD symptoms—hyperactivity–impulsivity | 4.51 (2.47) | 6.78 (2.61) | z = 4.69 | <0.001 |
| ADHD symptoms—total | 11.91 (2.78) | 13.97 (3.45) | z = 9.36 | <0.001 |
| Other psychopathology | ||||
| Oppositional defiant disorder | 34% | 44% | χ2 = 1.18 | 0.28 |
| Conduct disorder | 0 | n/a | n/a | n/a |
| Generalized anxiety disorder | 9% | 10% | χ2 = 0.05 | 0.82 |
| Separation anxiety disorder | 11% | 8% | χ2 = 0.21 | 0.65 |
| Major depressive disorder | 0% | 3% | χ2 = 1.16 | 0.28 |
| Tic disorder | 11% | n/a | n/a | n/a |
| ODD/CD symptoms | 3.86 (2.02) | 5.28 (3.13) | z = 2.23 | 0.03 |
| Worries symptoms | 1.41 (1.70) | 1.81 (2.28) | z = 0.95 | 0.34 |
| Depression symptoms | 0.62 (1.06) | 1.27 (1.89) | z = 1.28 | 0.20 |
ADHD, attention‐deficit/hyperactivity disorder; ODD, oppositional defiant disorder; CD, conduct disorder.
The bold values signify a P‐value ≤0.05.