Table 2.

Clinical characteristics of all participants.

Clinical variables	Training set (n = 204)			Test set (n = 170)
	NC	PD	P value	NC	PD	P value
	N = 102	N = 102		N = 91	N = 79
Age (years)a	66.00 (62.00, 71.00)	66.00 (59.25, 70.00)	0.236	66.00 (62.00, 71.00)	67.00 (61.00, 71.00)	0.902
Gender, n (%)b			0.069	66.00 (62.00, 71.00)	67.00 (61.00, 71.00)	0.293
Male	43 (42.16)	56 (54.90)		32 (35.16)	34 (43.04)
Female	59 (57.84)	46 (45.10)		59(64.84)	45(56.96)
MDS-UPDRS III	NA	24.00 (15.00, 30.75)		NA	NA
HY	NA	NA		NA	2.50 (2.00, 3.00)

Data are presented as the mean ± SD (range) for normally distributed data or median (interquartile range) (range) for non-normally distributed data. ^aThe P-value was calculated using t-test. ^bThe P-value was calculated using the chi-square test. MDS-UPDRS, MDS Unified-Parkinson Disease Rating Scale; HY, Hoehn and Yahr staging scale.