Table 2.
Average ADHD symptoms for the complete ADHD− and TD samples
| ADHD− Versus TD |
||||
|---|---|---|---|---|
| Group Differences |
||||
| ADHD− | TD | t | P | |
| n | 50 | 50 | ||
| DISC symptoms (0–23) | 16.31 ± 4.10 (48) |
3.78 ± 3.84 (45) |
−15.2 | <0.001* |
| CBCL Attention Problems t score | 66.88 ± 6.97 (50) |
52.00 ± 3.47 (49) |
−13.41 | <0.001* |
| SNAP-IV (0–9) | ||||
| Inattentiveness | 5.47 ± 2.53 (47) |
0.69 ± 1.13 (48) |
−11.94 | <0.001* |
| Hyperactivity | 6.21 ± 2.56 (48) |
1.25 ± 1.71 (48) |
−11.17 | <0.001* |
| Teachers Conners | ||||
| Inattention t score | 61.25 ± 11.77 (16) |
46.69 ± 8.53 (13) |
−3.73 | 0.001* |
| Hyperactive t score | 74.69 ± 12.97 (16) |
53.64 ± 16.93 (11) |
−3.66 | 0.001* |
| TRF ADHD t score | 58.83 ± 11.91 (6) |
53.25 ± 4.30 (8) |
−1.237 | 0.24 |
Values are means ± SD, with the number of participants with scores for each measure in parentheses. As expected, the medication-naive attention-deficit/hyperactivity disorder (ADHD−) group had significantly more ADHD symptoms compared with the typically developing (TD) group on all measures with the exception of the Teacher Report Form (TRF), which was completed in a small number of total cases. DISC, Diagnostic Structured Interview Schedule–young child version; CBCL, Child Behavior Checklist; SNAP-IV, Swanson Nolan and Pelham checklist.
*
P < 0.05, significant between-group difference.