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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