Table 1.

Clinical characteristics of the patients with PD and healthy controls.

	Control (n = 40)	PD (n = 48)	P-value
Age (years)	64.7 ± 6.8	67.2 ± 9.8	0.17
Gender (male, %)	52.5	50.0	0.83
Duration(years)	N.A.	9.1 ± 6.5	N.A
MMSE	N.A.	23.9 ± 5.8	N.A
Hoehn-and-Yahr stage	N.A.	2.8 ± 1.4	N.A

Numbers are expressed as mean ± standard deviation. P-values were determined by a parametric t-test and non-parametric chi-square and fisher exact tests.

MMSE, Mini-Mental Status Examination; N.A., not available; PD, Parkinson's disease.