Demographics of the patients with PD at baseline and of the control subjects
| Variable | All PD patients n=54 | Controls n=47 |
| Age (y, mean (SD)) | 61.4 (10.9) | 59.6 (9.4) |
| Female | 22 | 15 |
| Male | 32 | 32 |
| Duration of PD (y, mean (SD)) | 1.7 (1.6) | |
| Hoehn and Yahr stage, median | 1.5 | |
| UPDRS total (y, mean (SD)) | 31.7 (14.3) |
UPDRS=the Unified Parkinson's disease rating scale.