Demographic, clinical, neuropsychological, and neuroradiological variables of the two study groups.
| Variable | Parkinsonians n=25 (mean SD) | Controls n=25 (mean SD) | t/χ2 | p |
|---|---|---|---|---|
| UPDRS, Unified Parkinson’s Disease Rating Scale; MDRS, Mattis Dementia Rating Scale. | ||||
| Physical Anhedonia Scale | 32.4 (10)* | 43.1 (5.5) | 1.84 | 0.000 |
| Age (years) | 67.4 (5.9) | 66.2 (6.1) | 0.19 | 0.536 |
| Sex (M) | 15 | 12 | 0.67 | 0.31 |
| Education (years) | 7.6 (3.9) | 8.1 (3.4) | 0.90 | 0.672 |
| UPDRS part III | 30.3 (15.4) | – | – | – |
| Disease duration (months) | 58.8 (48.2) | – | – | – |
| Levodopa daily dosage (mg) | 370.6 (329.6) | – | – | – |
| MDRS | 129.5 (6.2)* | 137.3 (4.2) | 6.22 | 0.000 |
| Letter verbal fluency | 10.1 (2.7)* | 12.0 (2.2) | 2.07 | 0.019 |
| Category verbal fluency | 12.4 (3.1)* | 14.8 (2.4) | 1.89 | 0.009 |
| Executive Interview | 10.7 (5.3)* | 5.3 (3.7) | 3.57 | 0.001 |
| Spatial span | 5.1 (1.1) | 5.5 (0.8) | 1.31 | 0.200 |
| Geriatric Depression Scale | 12.8 (6.1)* | 6.7 (3.1) | 6.90 | 0.001 |
| Apathy Scale | 16.9 (5.6)* | 11.8 (3.2) | 3.77 | 0.003 |
| Bifrontal Index Cortex/Head | 91.5 (2.5) | – | – | – |
| Bifrontal Index Ventricles/Head | 26.5 (2.3) | – | – | – |