Table 1. Group characteristics of the ADHD group (N = 83) and TD group (N = 72).
| ADHD group | TD group | Statistic | |
|---|---|---|---|
| M (SD) | M (SD) | ||
| Age in months | 116.71 (19.86) | 119.17 (20.69) | t = -.75, NS |
| Males N (%) | 62 (74.70) | 37 (51.39) | χ2 = 9.08** |
| Parent-rated symptoms | |||
| Inattentiona | 17.47 (4.82) | 3.31 (3.07) | t = 22.11** |
| Hyperactivity/Impulsivitya | 16.31 (5.97) | 3.26 (2.71) | t = 17.92** |
| Inattentionb | 1.20 (.80) | -.46 (.72) | t = 13.64** |
| Hyperactivity/Impulsivityb | 1.30 (.90) | -.39 (.90) | t = 11.58** |
| ODDa | 9.72 (4.93) | 3.04 (2.71) | t = 10.63** |
| CDa | 2.45 (2.46) | .49 (.84) | t = 6.83** |
| ASDc | 61.77 (25.93) | 29.26 (14.23) | t = 9.84** |
| Teacher-rated symptoms | |||
| Inattentiona | 14.71 (6.23) | 1.85 (2.29) | t = 17.49** |
| Hyperactivity/Impulsivitya | 13.80 (7.39) | 1.57 (2.29) | t = 14.30** |
| Inattentionb | 1.04 (.85) | -.74 (1.02) | t = 11.66** |
| Hyperactivity/Impulsivityb | 1.08 (.95) | -.83 (1.08) | t = 11.60** |
| ODDa | 7.82 (6.04) | .89 (1.93) | t = 9.89** |
| CDa | 2.20 (3.03) | .18 (.66) | t = 5.93** |
| ASDc | 85.58 (21.84) | 25.07 (14.18) | t = 20.71** |
Notes.
a Disruptive Behaviour Disorder Rating Scale,
b Strengths and Weaknesses of ADHD-symptoms and Normal Behaviour rating scale,
c Social Responsiveness Scale.
**p < .01. ADHD, Attention-Deficit/Hyperactivity Disorder; ASD, Autism Spectrum Disorder; CD, Conduct Disorder; NS, not significant; ODD, Oppositional Defiant Disorder; TD, Typically Developing