Demographic characteristics of the cohort by fire department and combined (1950–2009)
| Description | All fire departments | San Francisco | Chicago | Philadelphia |
|---|---|---|---|---|
| Study cohort: | ||||
| Eligible for mortality analysis | 29 993 | 5313 | 15 185 | 9495 |
| PYAR | 858 938 | 154 317 | 419 414 | 285 207 |
| Years of follow-up; avg. (SD) | 29 (16) | 29 (16) | 28 (16) | 30 (16) |
| Race (%): | ||||
| White | 24 244 (80.8) | 4254 (80.1) | 11 736 (77.3) | 8254 (86.9) |
| Other | 5008 (16.7) | 986 (18.6) | 2808 (18.5) | 1214 (12.8) |
| Unknown | 741 (2.5) | 73 (1.4) | 641 (4.2) | 27 (<1.0) |
| Gender (%): | ||||
| Male | 29 002 (96.7) | 5009 (94.3) | 14 694 (96.8) | 9299 (97.9) |
| Female | 991 (3.3) | 304 (5.7) | 491 (3.2) | 196 (2.1) |
| Vital status: | ||||
| Alive (%) | 17 965 (59.9) | 3239 (61.0) | 9241 (60.9) | 5485 (57.8) |
| Deceased (%) | 12 028 (40.1) | 2074 (39.0) | 5944 (39.1) | 4010 (42.2) |
| Unknown cause of death | 144 | 9 | 91 | 44 |
| Attained age*; avg. (SD) | 60 (16) | 62 (16) | 59 (16) | 61 (16) |
| LTFU | 175 | 1 | 32 | 142 |
| PYAR potentially LTFU (%) | 8809 (1.0) | 59 (<1.0) | 1483 (<1.0) | 7267 (2.5) |
| Employment: | ||||
| Avg. hire year | 1968 | 1967 | 1970 | 1965 |
| Age at hire; avg. (SD) | 29 (5) | 29 (5) | 29 (5) | 27 (5) |
| Employment years; avg. (SD) | 21 (11) | 22 (11) | 21 (11) | 21 (11) |
| Hired before 1950 (%) | 8085 (27) | 1682 (32) | 3294 (22) | 3109 (33) |
| Employed <1 year (%) | 1328 (4.4) | 194 (3.7) | 891 (5.9) | 243 (2.6) |
*Age attained at earliest of the date of death, date LTFU or 31 December 2009.
Avg., average; LTFU, lost to follow-up; PYAR, person-years at risk.