Lung cancer cases and risks by exposure groups
| Exposure | Cases | Lung cancer risk | |||
| Group | Mid-point | Observed | Expected | SMR (95% CI) | RR (95% CI) |
| Total | 677 | 514.3 | 1.32 (1.22 to 1.42) | ||
| By occupational exposure to PAH* | |||||
| 0 | 0 | 35 | 56.0 | 0.62 (0.44 to 0.87) | 1.00 |
| 0.0000001– | 10 | 266 | 243.7 | 1.09 (0.96 to 1.23) | 1.75 (1.23 to 2.48) |
| 20– | 30 | 70 | 37.1 | 1.88 (1.47 to 2.38) | 3.02 (2.01 to 4.52) |
| 40– | 60 | 53 | 43.7 | 1.21 (0.91 to 1.59) | 1.94 (1.27 to 2.97) |
| 80– | 120 | 114 | 59.0 | 1.93 (1.59 to 2.32) | 3.09 (2.12 to 4.51) |
| 160– | 240 | 116 | 64.9 | 1.79 (1.48 to 2.15) | 2.86 (1.96 to 4.18) |
| 320– | 480 | 23 | 9.8 | 2.36 (1.49 to 3.54) | 3.77 (2.23 to 6.38) |
| By cigarettes† | |||||
| 0 | 0 | 58 | 72.3 | 0.80 (0.61 to 1.04) | 1.00 |
| 1– | 10 | 229 | 192.0 | 1.19 (1.04 to 1.36) | 1.49 (1.12 to 1.98) |
| 21– | 30 | 277 | 119.4 | 2.32 (2.05 to 2.61) | 2.89 (2.18 to 3.84) |
| 41– | 50 | 14 | 11.8 | 1.19 (0.65 to 2.00) | 1.48 (0.83 to 2.66) |
| 61– | 70 | 4 | 2.5 | 1.60 (0.44 to 4.09) | 1.99 (0.72 to 5.49) |
| Unknown | – | 95 | 116.3 | 0.82 (0.66 to 1.00) | 1.02 (0.73 to 1.41) |
PAH, polycyclic aromatic hydrocarbon; RR, relative risk; SMR, standardised mortality ratio.
*Cumulative exposure to BaP in μg/m3 years; †cigarettes in cigarettes/day.