Table 2.
Neuropsychological Performance Adjusted for Age for the Four Groups
| ADHD | ADHD+RD | RD | NC | |||||
|---|---|---|---|---|---|---|---|---|
| n = 24 | n = 29 | n = 41 | n = 26 | |||||
| Measure | M | SD | M | SD | M | SD | M | SD |
| Stop Signal Paradigm | ||||||||
| SSRT | 268.57 | 13.74 | 297.61 | 12.15 | 275.05 | 10.46 | 238.38 | 12.91 |
| MRT | 520.04 | 17.32 | 558.64 | 15.32 | 590.64 | 13.19 | 490.90 | 16.28 |
| Omission Errors | 2.22 | 0.91 | 5.01 | 0.81 | 3.23 | 0.69 | 0.31 | 0.86 |
| Commission Errors | 6.74 | 1.20 | 6.98 | 1.06 | 4.14 | 0.91 | 3.33 | 1.13 |
| Corsi Block Tapping test | ||||||||
| WM Maximum Span | 4.46 | 0.18 | 5.06 | 0.16 | 5.00 | 0.14 | 5.41 | 0.17 |
| Lexical Decisionª | ||||||||
| d′ | 2.68 | 0.17 | 1.99 | 0.15 | 2.38 | 0.13 | 3.16 | 0.16 |
| MRT Valid Words | 1092.25 | 70.70 | 1333.65 | 61.36 | 1304.02 | 51.67 | 868.78 | 64.19 |
| MRT Pseudowords | 1249.25 | 84.25 | 1575.60 | 73.12 | 1572.39 | 61.58 | 951.62 | 76.50 |
ADHD Attention deficit hyperactivity disorder; MRT Mean reaction time; NC Normal controls; RD Reading disorder; SSRT Stop signal reaction time; WM Working memory
ªTwo children in the ADHD only and one in the ADHD+RD group were missing because they had just started reading instruction and therefore the Lexical Decision task was too difficult.