Table 4. Correlation coefficients between NK cell, activating NK cell, and cardiovascular characteristics among staff members living in urban and forest environments (N = 200).

	NK cell		Activating NK cell
	Correlation coefficient	P-value	Correlation coefficient	P-value
Male	0.192	0.007	0.056	0.428
Age	0.260	< .001	–0.011	0.879
Body mass index	0.073	0.308	0.128	0.072
Systolic blood pressure	0.315	< .001	0.056	0.435
Diastolic blood pressure	0.353	< .001	0.081	0.256
Triglycerides	0.135	0.057	0.062	0.385
Cholesterol	0.123	0.083	–0.092	0.194
High-sensitivity C-reactive protein	0.144	0.042	0.034	0.631
Fasting glucose	0.174	0.014	–0.051	0.475
Smoking	0.057	0.424	0.054	0.450
Alcohol	0.126	0.075	–0.038	0.594
Coffee	–0.136	0.056	0.049	0.487
Tea	0.064	0.366	0.027	0.697