Age and exposure characteristics of study sample (n = 520)
| Mean | SD | Median | Range | |
|---|---|---|---|---|
| SD, standard deviation. | ||||
| Age (years) | 46.7 | 4.4 | 46.1 | 37.1–59.9 |
| Duration of exposure (years) | 21.8 | 5.3 | 21.9 | 6.3–34.5 |
| Number of jobs | – | – | 5 | 1–16 |
| Cumulative exposure respirable dust (mg.years/m3) | 8.2 | 2.88 | 7.95 | 0–22.68 |
| Average intensity respirable dust (mg/m3) | 0.37 | 0.096 | 0.36 | 0–0.70 |
| Cumulative exposure respirable quartz (mg.years/m3) | 1.15 | 0.43 | 1.12 | 0–3.08 |
| Average intensity respirable quartz (mg/m3) | 0.053 | 0.015 | 0.051 | 0–0.095 |