Table 1. Clinical data of PD patients and healthy control.

Variable		Control (n=42)		PD (n=44)		p-value (PD vs. control)
		NO.	%	NO.	%
Average age (mean ± SD, years)		55.42 ± 12.50		56.83 ± 17.12		0.67
Age(years)	≥55	23	54.76	27	61.36	0.54
	<55	19	45.24	17	38.64	-
Gender	Male	24	57.14	26	59.09	0.85
Smoking	Current	7	16.67	5	11.36	0.40
	Ever	19	45.24	19	43.18	-
	Never	16	38.09	20	45.45	-
Age at onset (years)		-		56.42 ± 7.14		-
Disease duration(years)		-		2.23 ± 1.27		-
H&Y scale	1.0	-		12	27.27	-
	1.5	-		8	18.18	-
	2.0	-		14	31.82	-
	2.5	-		10	22.73	-
UPDRS part-III		-		18.50 ± 1.53		-