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Table 1 Relative risk of lung cancer by smoking status and radon exposure [2]

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

  Cumulative radon exposure (WLM)
  <100 100–199 200–399 400–799 > − 800
Nonsmokers
 Cases 2 2 1 16 4
 Relative risk 1.0 2.2 0.7 9.9 9.2
  1. Table excludes 4088 subjects (74 lung cancer cases) with unknown smoking data
  2. WLM working level month