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Table 10 Incidence rate ratio for lung cancer associated with the concentration of radon at the residence [14]

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

Radon (Bq/m3) All residences, IRR (95 % CI)
Cases, n Model 1 Model 2
Non-smoker
  < 17.6 27 1.00 1.00
 17.6–39.5 24 0.91 (0.52–1.58) 1.16 (0.63–2.13)
 39.5–66.1 22 0.78 (0.44–1.37) 1.25 (0.60–2.59)
  > 66.1 26 0.85 (0.49–1.45) 1.48 (0.68–3.20)
Linear trend per 100 Bq/m3 99 0.82 (0.43–1.56) 1.67 (0.69–4.04)
  1. Model 1 was adjusted for age by using it as the time scale in the Cox model
  2. Model 2 was adjusted for age, sex, BMI, length of school attendance, socio-economic status, environmental tobacco smoke, fruit intake, alcohol intake, residence type, employment in an industry or job associated with higher risk for lung cancer, and traffic (time weighted average NOx exposure)
  3. IRR incidence rate ratio