Table 1.
Distribution of the studied population in different classes of risk on the basis of working information.
| Tasks/working stage | Exposure time (years) | Exposure period | Class of risk | Number of subjects |
|---|---|---|---|---|
| Cabine electrician | <20 | Not relevant | 1 | 6 |
| Machines maintenance-greasing | <10 | Not relevant | ||
| Tubes checking-inflating | <10 | Not relevant | ||
|
| ||||
| Cabine electrician | >20 | 2 | 20 | |
| Machines maintenance-greasing | 10–15 | |||
| Worker stages 1/2/4 (higher exposure risk) | <3 | 1962–1980 | ||
| Worker stages 1/2/4 (higher exposure risk) | <5 | 1981–2006 | ||
| Tubes checking-inflating | >10 | |||
|
| ||||
| Machines maintenance-greasing | >15 | 3 | 29 | |
| Worker stages 1/2/4 (higher exposure risk) | 3–5 | 1962–1980 | ||
| Worker stages 1/2/4 (higher exposure risk) | 5–10 | 1981–2006 | ||
|
| ||||
| Worker stages 1/2/4 (higher exposure risk) | 5–10 | 1962–1980 | 4 | 30 |
| Worker stages 1/2/4 (higher exposure risk) | >10 | 1981–2006 | ||
|
| ||||
| Worker stages 1/2/4 (higher exposure risk) | >10 | 1962–1980 | 5 | 74 |