Table 2: Description of the study population.
| All tungsten mines | Miners hired1 after 1950 | |
| N | 19,007 | 17,847 |
| Total person-years (PY) | 635,962 | 602,695 |
| Lung cancer cases (N) | 240 | 209 |
| Follow-up duration (year): Median (range) | 34.6 (0.8-43.9) | 34.6 (0.8-43.9) |
| Age at starting work: Median (range) | 22.6 (9.8-62.6) | 22.7 (15-44.9) |
| Age at beginning of follow-up: Median (range) | 25.6 (10.3-62.6) | 25.3 (15 -54.3) |
| Cumulative silica dust exposure (mg/m3-year)2: Total (Median, range) Lung cancer cases (Median, range) Non-cases (Median, range) |
2.23 (0.01-34.1) 3.28 (0.1-27.9) 2.22 (0.01-34.1) |
2.05 (0.01-31.4) 2.90 (0.1-24.9) 2.03 (0.01-31.4) |
| Cumulative silicosis cases (N, %) | 4228 (28.9%) | 3686 (26.0%) |
1Miners starting employment after January 1, 1950 and aged over 15 and under 45 years.
2Values given for dust exposed employees