Table 6. The effect of smoking in linear Cox models with unlagged cumulative exposure to Cr(VI).
| Model 1: all workers (n=714) | β (Potency factor)a | ||
|---|---|---|---|
| Smoking | Deviance | MLE | 95% CI |
| Not controlled | 1252.26 | 0.649 | (0.279, 1.367) |
| Controlled | 1236.45 | 0.581 | (0.222, 1.322) |
|
Comparison groups |
RR | ||
| Non-smokers vs workers with unknown smoking status | 0.39 | ||
| Smokers vs workers with unknown smoking status | 1.94 | ||
| Smokers vs non-smokers | 5.01 | ||
|
Model 2: workers with known smoking history
(n=200) |
β (Potency factor)a |
||
| Smoking | Deviance | MLE | 95% CI |
| Not controlled | 504.28 | 0.434 | (0.0913, 1.541) |
| Controlled | 488.05 | 0.535 | (0.125, 1.922) |
|
Comparison groups |
RR | ||
| Smokers vs non-smokers | 6.05 | ||
Abbreviations: MLE, maximum likelihood estimate; RR, relative risk for lung cancer.
a
The unit of β for the relative risk is (mg/m3-years)−1.