Table 4.

The results of two-piecewise linear regression model between selenium levels and all-cause or cardiovascular mortality.

	All-cause mortality HR (95% CI) P-value	Cardiovascular mortality HR (95% CI) P-value
Cutoff value, μg/L	136	130
<Cut-off value (per 10 μg/L increment)	0.75 (0.66, 0.85) <0.0001	0.60 (0.42, 0.86) 0.0051
>Cut-off value (per 10 μg/L increment)	1.08 (1.01, 1.16) 0.0207	1.15 (1.02, 1.31) 0.0255
P for log likelihood ratio test	<0.001	0.004

HR, hazard ratio; CI, confidence interval.

Two-piecewise linear regression model were adjusted for age, sex, race, education level, marital status, smoking, body mass index, systolic blood pressure, total cholesterol, high density lipoprotein cholesterol, C-reactive protein, alcohol consumption, estimated glomerular filtration rate, comorbidities (cardiovascular disease, diabetes, and cancer), and medication use (lipid-lowering drugs, hypoglycemic agents, antiplatelet drugs, and antihypertensive drugs).

P-value by two-piecewise Cox proportional hazards model.