Observed (Obs) and expected (Exp) number of deaths from chronic obstructive lung diseases (asthma, chronic bronchitis, and emphysema) and standardised mortality ratio (SMR) by cumulative exposure to total dust (mg/m3.y) and duration of employment
| All employees | Employment >3 y | |||||||
|---|---|---|---|---|---|---|---|---|
| Cumulative exposure to total dust (mg/m3.y) | Obs | Exp | SMR | 95% CI | Obs | Exp | SMR | 95% CI |
| 0 | 3 | 2.9 | 1.1 | 0.2 to 3.1 | 1 | 2.2 | 0.5 | 0.0 to 2.5 |
| 0–14.9 | 13 | 5.0 | 2.6 | 1.4 to 4.4 | 2 | 1.1 | 1.8 | 0.2 to 6.6 |
| 15–69.9 | 15 | 7.2 | 2.1 | 1.2 to 3.4 | 12 | 5.6 | 2.1 | 1.1 to 3.7 |
| >70 | 14 | 5.3 | 2.6 | 1.4 to 4.4 | 14 | 5.3 | 2.6 | 1.4 to 4.4 |