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Table 9 Adjusted HRs (95 % CIs) for lung cancer mortality per 100 Bq/m3 mean county-level residential radon concentrations (LBL) at enrollment (1982) stratified by selected risk factors, effect modification multiplicative scale, follow-up 1982–1988, CPS-II cohort, United States [13]

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

Characteristic n Lung cancer deaths Fully adjusted HR (95 % CI) P
Cigarette Smoking
 Never-Smoker 375,087 271 0.77 (0.47–1.25)  
 Current 152,033 1792 1.20 (1.00–1.44)  
 Former 203,253 941 1.09 (0.84–1.41) 0.66