Table 3.
Neuropsychological test scores and frequency of impairment in cognitive tests
| Neuropsychological tests | Results mean (SD) | Frequency of impairment (%)a |
|---|---|---|
| Trail Making Test A (s) | 30.0 (12.7) | 22.0 |
| Trail Making Test B (s) | 82.6 (36.9) | 29.3 |
| Symbol Digit Modality Test (number correct) | 45.7 (10.4) | 26.8 |
| Stroop interference (s) | 135.6 (57.3) | 31.7 |
| Category verbal fluency | 25.6 (6.5) | 7.3 |
| Lexical fluency, s-words | 13.8 (4.8) | 9.8 |
| Lexical fluency, a-words | 8.8 (3.2) | 4.9 |
| Rey’s Complex Figure Test, recall | 24.6 (6.4) | 2.4 |
| Rey’s Complex Figure Test, copy | 35.5 (1.0) | 2.4 |
| Ravens Matrices Advanced | 7.9 (2.4) | 14.6 |
| Selective Reminding Test immediate recall | 9.7 (8.5) | 9.8 |
| Selective Reminding Test delayed recall | 8.7 (1.1) | 9.8 |
| Block design | 11.2 (1.6) | 24.4 |
| Hamilton Depression Rating Scale | 5.4 (4.3) |
aImpairment was based on comparisons between observed and expected scores. Based on regression analyses, scores in the lowest 10% of the normal variation were categorised as impaired