Table 1. Demographic and clinical data for all Parkinson’s Disease patients (all PD), the Chinese (Chinese PD) and German (German PD) cohorts of PD; healthy probands and its subgroups of young (20–40 years old) healthy subjects and age matched controls for the PD groups.

	all PD	Chinese PD	German PD	all probands	Chinese probands	Chinese young probands	Chinese controls	German probands	German young probands	German controls
Number	80	39	41	170	70	38	32	100	38	42
Gender (female/male)	32/48	20/19	12/29	105/65	43/27	21/17	22/10	62/38	23/15	24/18
Age years (mean ± SD; min/max)	65.5 ± 9.3; 39.6/88.1	64.1 ± 9.2; 39.6/82.1	66.8 ± 9.2; 49.7/88.1	45.8 ± 16.7; 21.6/84.7	43.7 ± 17.4; 21.8/84.7	29.5 ± 5.1; 21.8/39.5	60.6 ± 10.1; 41.9/84.7	47.2 ± 16.2; 21.6/82.7	29.9 ± 5.5; 21.7/40.4	62.9 ± 8.6; 52.9/82.7
Education (median (interquartile range))	12.0 (6.0)	12.0 (7.0)	12.0 (3.38)	15.0 (5.0)	16.0 (7.0)	18.0 (4.0)	12.0 (6.0)	15 (13;17)	15.0 (3.5)	14.0 (4.0)
Smoking (x/all)	13/80	5/39	8/41	30/170	2/70	1/38	1/32	28/100	7/38	14/42
Pack years (median (interquartile range))	0.0 (0.0)	0.0 (0.0)	0.0 (0.0)	0.0 (0.0)	0.0 (0.0)	0.0 (0.0)	0.0 (0.0)	0.0 (2.0)	0.0 (0.0)	0.0 (2.75)
SIT-12 (median of correct answers (interquartile range))	6.0 (4.0)	7.0 (3.0)	5.0 (4.5)	11.0 (1.0)	10.0 (2.0)	10.0 (2.0)	9.0 (3.0)	11.0 (2.0)	11.0 (2.0)	11.0 (1.25)
Ch-SIT 12 (median of correct answers (interquartile range))	6.5 (4.0)	7.0 (4.0)	6.0 (4.5)	11.0 (2.0)	11.0 (1.25)	11.0 (2.0)	10.0 (1.0)	11.0 (2.0)	11.0 (1.0)	11.0 (2.25)
Disease Duration in months (median (interquartile range))	42.0 (108.0)	24.0 (38.0)	96.0 (143.0)
UPDRS III (median (interquartile range))	25.0 (22.0)	22.0 (18.0)	27.0 (22.0)