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Table 6 Results of cohort studies of risk estimates of lung cancer in underground miners from exposure to radon progeny [7]

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

Cohort study N Mean years of follow-up after start of work Absolute risk coefficient/106 person-yr/WLM Relative risk coefficient/WLM
Sweden iron, 1951–76 1294 44 19 0.036
Smokers   44 22 0.024
Nonsmokers   44 16 0.107
  1. WLM working level month