| Cases (n = 635) | Referents (n = 635) | |
| Age at start of employment (year) | ||
| Mean | 35.8 | 35.7 |
| Median | 35.9 | 35.8 |
| SD | 8.54 | 8.47 |
| Range | 16.0–50.7 | 15.8–50.9 |
| Year of recruitment | ||
| Mean | 1956 | 1956 |
| Median | 1955 | 1955 |
| SD | 6.8 | 6.8 |
| Range | 1948–85 | 1948–85 |
| Censored duration of employment (year)* | ||
| Total duration | 7730 | 7354 |
| Mean | 12.2 | 11.6 |
| Median | 10.5 | 8.3 |
| SD | 10.2 | 10.5 |
| Range | 0.08–41.62 | 0.09–40.46 |
| Age on leaving (year)† | ||
| Mean | 48.5 | 47.8 |
| Median | 49.8 | 47.9 |
| SD | 13.2 | 13.4 |
| Range | 17.9–65.8 | 18.7–66. 5 |
*Duration of employment for referents was censored at the date of matched case’s death.
†For workers employed for more than one period of time, the mean age at leaving is longer than the sum of age at start of employment and duration of employment.