Table 4

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

Selenium tertilesSelenium casesPlacebo casesHRa (95% CI)P
Lowest tertile 42–106 ng/ml8190.42 (0.18, 0.96)0.04
Middle tertile 106–122 g/ml780.91 (0.33, 2.52)0.86
Highest tertile 122–220 g/ml1081.25 (0.49, 3.21)0.64
  • a Cox proportional hazards model; adjusted for age, smoking status (current, former, never).