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
| Â | 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 |