Table 1B: Distribution of exposure metrics for respirable coal mine dust and quartz dust in this inception cohort of 1352 coal miners.
| median | mean | sd | min | max | |
| Respirable coalmine dust | |||||
| Long-term average concentration (mg/m3) | 2.34 | 2.47 | 0.65 | 0.84 | 4.51 |
| Total duration (dust-years) | 17.07 | 15.11 | 6.69 | 0.72 | 28.00 |
| Total cumulative exposure (mg/m3-years) | 37.00 | 37.41 | 19.67 | 1.13 | 100.15 |
| Respirable quartz dust | |||||
| Long-term average concentration (mg/m3) | 0.09 | 0.09 | 0.03 | 0.00 | 0.26 |
| Total duration (quartz-years) | 12.92 | 11.46 | 5.84 | 0.00 | 22.86 |
| Total cumulative exposure (mg/m3-years) | 0.99 | 1.05 | 0.67 | 0.00 | 3.76 |