American Association for Cancer Research

Table 4

Risk of lung cancer incidence by treatment group and tertile of baseline plasma selenium

Selenium tertiles	Selenium cases	Placebo cases	HR^a (95% CI)	P
Lowest tertile 42–106 ng/ml	8	19	0.42 (0.18, 0.96)	0.04
Middle tertile 106–122 g/ml	7	8	0.91 (0.33, 2.52)	0.86
Highest tertile 122–220 g/ml	10	8	1.25 (0.49, 3.21)	0.64

Selenium tertiles	Selenium cases	Placebo cases	HR^a (95% CI)	P
Lowest tertile 42–106 ng/ml	8	19	0.42 (0.18, 0.96)	0.04
Middle tertile 106–122 g/ml	7	8	0.91 (0.33, 2.52)	0.86
Highest tertile 122–220 g/ml	10	8	1.25 (0.49, 3.21)	0.64

Cox proportional hazards model; adjusted for age, smoking status (current, former, never).