Mortality from lung cancer and from all causes in workers who have achieved five years cumulative employment in specified job categories
| Job category† | n | Obs | Exp‡ | SMR | (95% CI) |
|---|---|---|---|---|---|
| *p<0.05. | |||||
| †Subjects can contribute person-years-at-risk and observed deaths to more than one category. | |||||
| ‡Based on mortality rates for England and Wales. | |||||
| Lung cancer | |||||
| Feed handling and nickel extraction | 142 | 9 | 3.9 | 231* | (106 to 439) |
| Pellet and powder production | 219 | 9 | 5.3 | 171 | (78 to 325) |
| Nickel salts and derivatives | 121 | 6 | 2.7 | 219 | (80 to 477) |
| Wet treatment and related processes | 166 | 7 | 5.6 | 125 | (50 to 257) |
| Gas plant | 47 | 1 | 1.2 | 84 | – |
| Engineering and site wide activities | 343 | 7 | 7.8 | 90 | (36 to 186) |
| All causes | |||||
| Feed handling and nickel extraction | 142 | 32 | 37.6 | 85 | (58 to 120) |
| Pellet and powder production | 219 | 40 | 51.2 | 78 | (56 to 106) |
| Nickel salts and derivatives | 121 | 28 | 26.5 | 106 | (70 to 153) |
| Wet treatment and related processes | 166 | 59 | 53.7 | 110 | (84 to 142) |
| Gas plant | 47 | 9 | 11.3 | 80 | (36 to 151) |
| Engineering and site wide activities | 343 | 66 | 77.1 | 86 | (66 to 109) |