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Table 7 Relative risks for lung cancer by exposure to radon progeny, with and without adjustment for cigarette smoking, in a cohort of New Mexico underground uranium miners [8]

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

Exposure category Cigarette smoking
Number of cases Unadjusted (95 % CI) Adjusted (95 % CI)
0–99.9 11 1.0 1.0
100–199.9 12 2.2 (1.0–5.1) 2.2 (0.9–5.0)
200–299.9 10 2.8 (1.2–6.7) 2.7 (1.1–6.6)
300–399.9 11 7.3 (3.1–17.2) 7.1 (3.0–16.8)
400–499.9 9 10.7 (4.3–26.4) 10.8 (4.4–26.7)
500–749.9 8 9.5 (3.7–24.2) 9.0 (3.6–23.0)
750–999.9 2 10.3 (2.2–46.9) 9.9 (2.2–45.5)
≥ 1000 4 12.3 (3.9–39.1) 13.5 (4.3–43.1)
  1. This was calculated by Poisson regression with adjustment for ethnicity, calendar year and age