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| Cumulative exposure to | Exposed (%) | Mean | Median | Max | s.d. |
|---|---|---|---|---|---|
| Silica (mg m−3-years) | 100 | 5.9 | 1.8 | 56 | 8.0 |
| Radon (WLM) | 86 | 280 | 33 | 3224 | 445 |
| Arsenic (μg m−3-years) | 31 | 121 | 67 | 1417 | 145 |
Abbreviation: WLM=working level months.
