Demographics and clinical characteristics.

Data are presented with median (range) and frequency. Statistical comparisons were performed with the Kruskal-Wallis / Wilcoxon rank sum test, and the Pearson / Fisher’s Exact test, with analyses between single cohorts using Bonferroni correction (controls versus early PD, controls versus mid-stage PD, early PD versus mid-stage PD, p ° Compared to controls* Compared to early Parkinson’s disease (PD).BDI, Becks Depression Inventory; MMSE, Mini-Mental State Examination; UPDRS III, Motor part of the Unified Parkinson’s Disease Rating Scale.Demographics and clinical characteristics.