Table 2 Results of neuropsychological tests before and after surgery.
| Score (mean±SD) | |||
|---|---|---|---|
| Before surgery | 3 Month follow up | 12 Month follow up | |
| Mattis Dementia Rating Scale (maximal score 144) | 136.3±5.8 | 135.0±9.5 | 136.1±7.3 |
| Grober and Buschke Verbal Learning Test | |||
| Free recall (maximal score 48) | 26.2±6.2 | 26.9±7.7 | 28.3±7.1** |
| Total recall (maximal score 48) | 45.4±4.3 | 45.3±4.7 | 46.4±2.7* |
| Delayed recall (maximal score 16) | 15.6±0.9 | 15.6±0.9 | 15.7±0.9 |
| Delayed free recall (maximal score 16) | 10.1±2.9 | 10.3±3.2 | 10.5±2.6 |
| Wisconsin Card Sorting Test (maximal score 20) | 15.8±4.7 | 16.9±4.2* | 16.7±4.1* |
| Beck Depression Inventory (maximal score 59) | 11.5±7.0 | 7.0±4.9** | 10.9±7.4 |
| Lexical Fluency (maximal score 10) | 8.1±2.0 | 7.2±2.2** | 7.2±2.1** |
| Graphic Series (maximal score 10) | 7.8±2.6 | 8.0±2.8 | 7.9±2.5 |
| Motor Series (maximal score 10) | 8.0±3.2 | 8.3±2.8 | 8.7±2.2* |
| Global Frontal Score (maximal score 50) | 39.6±9.5 | 40.6±9.2 | 40.5±7.2 |
*p<0.002 compared with the preoperative score; **p<0.0001 compared with the preoperative score.