Observed (Obs) and expected (Exp) numbers of cases of lung cancer and standardised incidence ratio (SIR) by cumulative exposure to PAHs (μg/m3×year)
| Cumulative exposure to PAHs (μg/m3×year) | Obs | Exp | SIR | 95% CI |
| Lag 3 y: | ||||
| <50 | 12 | 13.5 | 0.9 | 0.5 to 1.6 |
| 50–1000 | 11 | 6.3 | 1.7 | 0.9 to 3.1 |
| 1000–3000 | 2 | 5.8 | 0.4 | 0.0 to 1.3 |
| >3000 | 2 | 5.0 | 0.4 | 0.1 to 1.4 |
| Lag 20 y: | ||||
| <50 | 14 | 15.6 | 0.9 | 0.5 to 1.5 |
| 50–1000 | 11 | 7.2 | 1.5 | 0.8 to 2.7 |
| 1000–3000 | 1 | 5.6 | 0.2 | 0.0 to 1.0 |
| >3000 | 1 | 2.2 | 0.5 | 0.0 to 2.5 |