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Table 2 Lung cancer in miners according to smoking status [3]

From: Radon exposure and lung cancer: risk in nonsmokers among cohort studies

Group followed Mean WLM Person-years at risk Lung Cancer Attributable cancers Ratio of risk in smokers and nonsmokers
Observed (95 % CI) Exp.
Nonsmokers 31.7 5138 3 (0.7–9.3) 0.3 16.6 1.6
Smokers 29.7 9420 19 (12.1–29.4) 11.7 26.1
Total 30.4 14,558 22 (14.6–32.5) 12.0 22.6  
  1. WLM working level month