Table 3 Number of subjects (n), observed deaths, and age adjusted relative risks (RR) plus 95% confidence intervals (CI) for lung cancer and all‐cause mortality by categories of smoking habits among male German carbon black workers between 1976 and 1998.
| Smoking cigarettes/day | n | Deaths | RR | 95% CI |
|---|---|---|---|---|
| Lung cancer, ICD‐9 162 | ||||
| Never‐smoker | 189 | 2 | 1.00 | |
| >0–12 | 157 | 9 | 4.86 | 1.05–22.50 |
| >12–24 | 399 | 17 | 5.89 | 1.35–25.60 |
| >24 | 167 | 7 | 7.50 | 1.53–36.68 |
| Ex–smoker | 267 | 1 | 0.50 | 0.05–5.57 |
| No information | 349 | 14 | 2.77 | 0.63–12.18 |
| All‐cause mortality* | ||||
| Never‐smoker | 190 | 27 | 1.00 | |
| >0–12 | 158 | 54 | 2.13 | 1.34–3.39 |
| >12–24 | 400 | 92 | 2.27 | 1.47–3.49 |
| >24 | 168 | 28 | 2.05 | 1.20–3.50 |
| Ex‐smoker | 267 | 19 | 0.66 | 0.36–1.19 |
| No information | 352 | 112 | 1.63 | 1.07–2.48 |
*Includes seven additional deaths with unknown cause of death.