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Table 11 Adjusted incidence rate ratios for lung cancer in association with a 100 Bq/m3 increase in domestic radon within strata of sex, NOx at the residential address, and ETS [14]

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

Interaction variable Cases, n Nonsmokers IRR (95 % CI) P
Sex
 Men 46 1.35 (0.44–4.11) 0.52
 Women 53 2.02 (0.70–5.76)  
NOx at front (ug/m3)
  < 21.8 48 1.80 (0.60–5.42) 0.92
  ≥ 21.8 51 1.68 (0.54–5.23)  
ETS
 No 34 1.19 (0.34–4.20) 0.45
 Yes 65 1.99 (0.74–5.33)  
  1. Adjusted for age, sex, BMI, length of school attendance, socio-economic status, environmental tobacco smoke, fruit intake, alcohol, residence type, employment in an industry or job associated with higher risk for lung cancer, and traffic (time weighted average NOx exposure)
  2. ETS environmental tobacco smoke