Table 1.
Demographics and Clinical Features.
| ASD + ADHD (n = 107) |
ADHD (n = 74) |
Test statistic | p value | |
|---|---|---|---|---|
| Demographics | ||||
| Age (years) | 11.0 ± 3.4 | 11.4 ± 3.2 | t = 0.76 | .45 |
| Gender (male) | 94 (88) | 57 (77) | χ2(1) = 3.71 | .05 |
| Race (Caucasian) | 88 (83) | 67 (91) | χ2(1) = 2.06 | .15 |
| SES | 2.04 ± 0.97 | 1.38 ± 0.62 | t = −5.06 | <.0001 |
| IQ | ||||
| M | 97 ± 14 | 102 ± 16 | t = 2.20 | .03 |
| Range | 70–133 | 71–132 | ||
| >85 | 85 (79) | 62 (84) | χ2(1) = 0.54 | .46 |
| ASD diagnosis (DSM-IV) | ||||
| Autistic disorder | 67 (63) | NA | ||
| Asperger’s disorder | 25 (23) | NA | ||
| PDD-NOS | 15 (14) | NA | ||
| Psychosocial functioning | ||||
| Global assessment of functioning | ||||
| Lifetime | 45.9 ± 5.0 | 48.1 ± 7.5 | t = 2.35 | .02 |
| Current | 51.1 ± 4.7 | 53.2 ± 6.4 | t = 2.51 | .01 |
| School functioning | ||||
| Repeated grade | 10 (19) | 8 (11) | χ2(1) = 2.15 | .14 |
| Extra tutoring | 82 (77) | 59 (80) | χ2(1) = 0.24 | .62 |
| Special class | 55 (51) | 17 (23) | χ2(1) = 14.76 | <.001 |
Note. Values expressed as n (%) or M±SD. Bolded values indicate statistical significant at p ≤ 0.05. ASD = autism spectrum disorder; SES = socio-economic status; IQ= intelligence quotient; NA = not applicable; DSM-IV = Diagnostic and Statistical Manual of Mental Disorders (4th ed.); PDD-NOS = pervasive developmental disorders–not otherwise specified.