Table I.
Descriptive statistics of the Colorado Plateau uranium miners cohort. The data included here refer to the follow-up on December 31, 1982. Exposure to radon is measured in working level months (WLM), while smoking is reported as packs of cigarettes/100
| Full cohort | Lung cancer cases | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| N | % | N | % | |||||||
| Subjects | 3347 | 100.0 | 258 | 7.7 | ||||||
| Deaths (%) | 1258 | 37.6 | 258 | 100.0 | ||||||
| Ever smokers (%) | 2656 | 79.4 | 238 | 92.2 | ||||||
| Median | Min | 25th | 75th | Max | Median | Min | 25th | 75th | Max | |
|---|---|---|---|---|---|---|---|---|---|---|
| Age at entry | 34.0 | 15.8 | 25.8 | 44.0 | 80.0 | 41.6 | 18.6 | 34.3 | 48.0 | 63.9 |
| Follow-up time (years) | 23.9 | 0.1 | 19.6 | 25.5 | 32.5 | 18.3 | 0.3 | 12.9 | 22.0 | 30.8 |
| Exposure to radon | ||||||||||
| Exposure period (years) | 6.7 | 0.1 | 2.7 | 11.8 | 53.0 | 12.8 | 0.1 | 7.8 | 17.6 | 39.5 |
| Total cumulative exposure (WLM/year) | 429.0 | 0.0 | 153.5 | 1016.8 | 10,000.0 | 1231.9 | 8.0 | 553.7 | 2528.6 | 10,000.0 |
| Yearly exposure (WLM/year) | ||||||||||
| All | 60.2 | 0.1 | 26.7 | 122.2 | 3245.3 | 81.6 | 1.0 | 42.3 | 165.4 | 1295.7 |
| Lag 0–9 | 52.4 | 0.1 | 23.8 | 102.5 | 2994.0 | 61.4 | 3.9 | 31.3 | 144.7 | 1110.8 |
| Lag 10–19 | 53.8 | 0.1 | 24.3 | 112.5 | 3245.3 | 78.3 | 1.0 | 42.9 | 164.0 | 1295.7 |
| Lag 20–29 | 74.0 | 0.1 | 33.0 | 141.7 | 3245.3 | 104.7 | 4.1 | 52.2 | 180.0 | 1295.7 |
| Lag 30–40 | 95.7 | 0.2 | 48.0 | 151.6 | 2994.0 | 104.7 | 5.5 | 60.0 | 175.3 | 860.2 |
| Smoking | ||||||||||
| Exposure period (years) | 38.0 | 5.0 | 31.0 | 46.0 | 75.0 | 40.0 | 14.0 | 33.0 | 48.0 | 72.0 |
| Total cumulative exposure (packs × 100) | 131.6 | 0.4 | 94.5 | 174.5 | 676.3 | 147.4 | 21.8 | 109.5 | 188.1 | 567.2 |
| Yearly exposure (packs × 100) | 3.6 | 0.0 | 2.5 | 3.6 | 24.4 | 3.6 | 0.0 | 3.5 | 4.2 | 13.4 |