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Baseline characteristics of the 40 patients in the study at the time of surgery
| Age/years (mean ± SD) | 59 ± 9 |
| Sex | |
| Male | 28 (70%) |
| Female | 12 (30%) |
| Duration of disease/years (mean ± SD) | 9 ± 3 |
| Baseline LEDD/mg (mean ± SD) | 1233 ± 608 mg |
| Hoehn and Yahr stage (median, range) | 2 (1–5) |
| Indication for DBS | |
| Motor fluctuations and dyskinesia | 33 (83%) |
| Disabling tremor | 7 (17%) |
LEDD levodopa equivalent daily dose,30 SD standard deviation
