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Table 3 Standardized mortality ratios and standardized rate ratios by smoking status and cumulative radon progeny exposure category (lagged 5 years) for lung cancer among Colorado Plateau uranium miners, 1960–2005 [4]

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

  Cumulative exposure to radon progeny from uranium mining (WLM) Trend slope, cases/WLM person-year
<120 120– < 400 400– < 1000 > − 1000
Never smoker 4.5 × 10−6c
 No. 2 9 22 43
 SMR (95 % CI) 0.25 (0.03–0.89) 0.87 (0.40–1.7) 2.9 (1.8–4.4) 6.3 (4.6–8.5)
 SRR (95 % CI) 1.0 (ref) 3.5 (0.75–16) 13 (3.0–54) 29 (7.0–120)
  1. SMR standardized mortality ratio, SRR standardized rate ratio, WLM working level month