Table 2.

Correlation analysis between leukocyte apoptosis, ^99mTc-TRODAT-1 striatal uptake binding ratio, and clinical variables in the PD group after controlling for age and sex.

	Variables	r	P value
Total leukocyte apoptosis (%)	Striatal dopamine transporter uptake ratios mean	−0.349	0.020
	Striatal dopamine transporter uptake ratios R	−0.384	0.012
	Striatal dopamine transporter uptake ratios L	−0.252	0.108
	UPDRS I	0.293	0.041
	UPDRS II	0.480	0.000
	UPDRS III	0.555	0.000
	UPDRS total	0.537	0.000
	Modified Hoehn-Yahr Staging Scale	0.461	0.001
	Schwab and England Activities of Daily Living Scale	−0.463	0.001
	Duration of disease	0.293	0.039
Neutrophil apoptosis (%)	Striatal dopamine transporter uptake ratios mean	−0.253	0.098
	Striatal dopamine transporter uptake ratios R	−0.272	0.082
	Striatal dopamine transporter uptake ratios L	−0.244	0.120
	UPDRS I	0.120	0.413
	UPDRS II	0.298	0.037
	UPDRS III	0.356	0.012
	UPDRS total	0.335	0.019
	Modified Hoehn-Yahr Staging Scale	0.378	0.007
	Schwab and England Activities of Daily Living Scale	−0.318	0.026
	Duration of disease	0.145	0.315
Striatal dopamine transporter uptake ratios R	UPDRS III	−0.349	0.019
	UPDRS total	−0.330	0.027
	Modified Hoehn-Yahr Staging Scale	−0.373	0.012
Striatal dopamine transporter uptake ratios L	UPDRS II	−0.295	0.049
	UPDRS III	−0.328	0.028
	UPDRS total	−0.307	0.040
	Modified Hoehn-Yahr Staging Scale	−0.390	0.008
	Schwab and England Activities of Daily Living Scale	0.332	0.026

UPDRS: Unified Parkinson's Disease Rating Scale.