Cohort characteristics
| Workers (n) | 356 |
| Men (n (%)) | 307 (86.2) |
| Alive at the 31 December 1990 (n (%)) | 288 (80.9) |
| Lost to follow-up (n (%)) | 24 (6.7) |
| Dead at the 31 December 1990 (n (%)) | 44 (12.4) |
| Of unknown causes (n (%)) | 6 (13.6) |
| Mean (range) age at entry into cohort | 30.1 (16–57) |
| Mean (range) age of those alive on 31 December 1990 | 60.9 (43–91) |
| Year of entry (range) | (1950–68) |
| Year of end of follow up (range) | (1955–90) |
| Mean duration of follow up (y) | 30.4 (2–40) |
| Total person-years (n) | 10820 |
| Mean (range) duration of work in the Metallurgy Department (y) | 16.9 (1–37) |