Characteristics of the cohort and exposures by fire department and combined (1950–2009)
| Description | All | SFFD | CFD | PFD |
|---|---|---|---|---|
| Study cohort | 19 309 | 3101 | 10 332 | 5876 |
| Race (%) | ||||
| Caucasian | 15 123 (78.3) | 2297 (74.1) | 7972 (77.2) | 4854 (82.6) |
| Other | 4186 (21.7) | 804 (25.9) | 2360 (22.8) | 1022 (17.4) |
| Vital status | ||||
| Alive (%) | 15 279 (79.1) | 2640 (85.1) | 7868 (76.1) | 4771 (81.19) |
| Deceased (%) | 4030 (20.9) | 461 (14.9) | 2464 (23.9) | 1105 (18.8) |
| Employment | ||||
| Average hire year | 1978 | 1979 | 1978 | 1977 |
| Age at hire; average (SD) | 28.3 (5) | 29.3 (5.6) | 29.0 (5.1) | 26.6 (4.8) |
| Employment years; average (SD) | 20.7 (10.6) | 20.3 (9.9) | 21.4 (10.7) | 19.5 (10.8) |
| Apparatus: run-years | ||||
| Available (%) | 13 517 (79.9) | NA | 8430 (78.2) | 5087 (82.8) |
| Estimated (%) | 3404 (20.1) | NA | 2348 (21.8) | 1056 (17.2) |
| Exposure | ||||
| Exposed-days percentile | ||||
| Average (SD) | 5721 (3690) | 5929 (3722) | 5486 (3583) | 6024 (3827) |
| 10% | 728 | 821 | 441 | 943 |
| 25% | 2511 | 2646 | 2539 | 2412 |
| 50% | 5626 | 6210 | 5157 | 6115 |
| 75% | 8751 | 9428 | 8372 | 8936 |
| 100% | 16 672 | 14 649 | 14 866 | 16 672 |
| Fire-runs percentile | ||||
| Average (SD) | 5954 (4750) | NA | 5627 (4706) | 6530 (4772) |
| 10% | 490 | NA | 294 | 773 |
| 25% | 2107 | NA | 1937 | 2538 |
| 50% | 5164 | NA | 4693 | 5965 |
| 75% | 8795 | NA | 8197 | 9661 |
| 100% | 35 841 | NA | 35 841 | 27 213 |
| Fire-hours percentile | ||||
| Average (SD) | 1548 (1144) | NA | 1548 (1144) | NA |
| 10% | 107 | NA | 107 | NA |
| 25% | 617 | NA | 617 | NA |
| 50% | 1381 | NA | 1382 | NA |
| 75% | 2322 | NA | 2322 | NA |
| 100% | 7417 | NA | 7417 | NA |
CFD, Chicago Fire Department; NA, not available; PFD, Philadelphia Fire Department; SFFD, San Francisco Fire Department.