Summary of lung cancer risk estimates by treatment group
Analysis period | Number of cases selenium/placebo | RR (95% CI) | P | HRa (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) .