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Table 2

Summary of lung cancer risk estimates by treatment group

Analysis periodNumber of cases selenium/placeboRR (95% CI)PHRa (95% CI)P
1983–1993b 17 31 0.54 (0.30, 0.98) 0.04 0.56 (0.31, 0.76) 0.05 
1983–1996 25 35 0.70 (0.40, 1.21) 0.18 0.74 (0.44, 1.24) 0.26 
Analysis periodNumber of cases selenium/placeboRR (95% CI)PHRa (95% CI)P
1983–1993b 17 31 0.54 (0.30, 0.98) 0.04 0.56 (0.31, 0.76) 0.05 
1983–1996 25 35 0.70 (0.40, 1.21) 0.18 0.74 (0.44, 1.24) 0.26 
a

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

b

Clark et al.(3).

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