| Mean | median | SD | Range (IQR) | |
| Age (y) | 71.5 | 73 | 8.6 | 45–91 |
| Time since diagnosis (y) | 8.12 | 5 | 6.9 | 1–38 (IQR 3–11) |
| Hoehn & Yahr stage (max 5 severe) | 2.5 | 2.5 | 0.88 | 1–5 (IQR 2–3) |
| UPDRS II (max 52 severe) | 14.6 | 15 | 6.4 | 1–33 |
| UPDRS III (max 108 severe) | 34.5 | 34 | 14.9 | 8–73 |
| MMSE14 (⩾23 normal) | 25.3 | 27 | 3.7 | 14–30 (IQR 23–28) |
| GDS15 (⩽4 normal) | 4.8 | 4 | 3.3 | 0–14 (IQR 2–7) |
GDS, Geriatric Depression Scale; MMSE, Mini-Mental State Examination; UPDRS, Unified Parkinson’s Disease Rating Scale.