Demographic and mining characteristics of cases
| N | 322 |
| White (n, %) | 284 (88.2) |
| Age at death (years) (mean, SD) | 71.2 (9.0) |
| Year of birth (median, IQR) | 1914 (1906–1920) |
| Year of death (median, IQR) | 1984 (1978–1992) |
| Coal mine experience (n, %) | |
| Underground only | 259 (80.4) |
| Underground and surface | 56 (17.4) |
| Incomplete data | 7 (2.2) |
| Total years of coal mining (mean, SD)* | 36.3 (9.2) |
| Years of underground coal mining† | 34.5 (10.6) |
| Years of surface coal mining† | 1.8 (5.9) |
| Ever smoker (n, %) | 201 (62.4) |
| States worked‡ | |
| Central Appalachia | 130 (42.4) |
| West Virginia | 90 (30.0) |
| Virginia | 29 (9.0) |
| Kentucky | 11 (3.4) |
| Rest of USA | 209 (64.9) |
| Pennsylvania | 186 (57.8) |
| Ohio | 13 (4.0) |
| Other states§ | 10 (3.1) |
| Unknown/incomplete | 2 (0.6) |
*Data for n=319 subjects due to incomplete information.
†Data for n=315 subjects due to incomplete information.
‡Subject ever had any coal mine employment listed in these states; sum of percentages exceeds 100% because miners may have worked in multiple states.
§Other states were Illinois, Alabama, Utah, Colorado and Wyoming.