Table 1.
Selected cohort characteristics
| Variable | Overall (N = 12,264) | Firefighters (n = 10,301) | EMS (n = 1,963) |
|---|---|---|---|
| Age on 9/11/2001, yr | 39.7 ± 7.8 | 40.4 ± 7.4 | 35.9 ± 8.6 |
| PFT examinations | 11.2 ± 4.1 | 11.1 ± 3.9 | 12.0 ± 5.2 |
| Post-9/11 follow-up, yr | 19.1 ± 2.6 | 19.1 ± 2.6 | 18.9 ± 2.5 |
| Race/ethnicity | |||
| White | 10,756 (87.7) | 9,701 (94.2) | 1,055 (53.7) |
| Black | 696 (5.7) | 268 (2.6) | 428 (21.8) |
| Hispanic | 812 (6.6) | 332 (3.2) | 480 (24.5) |
| Sex | |||
| Male | 11,862 (96.7) | 10,277 (99.8) | 1,585 (80.7) |
| Female | 402 (3.3) | 24 (0.2) | 378 (19.3) |
| Smoking status | |||
| Never | 7,819 (63.8) | 6,804 (66.1) | 1,015 (51.7) |
| Current/former | 4,445 (36.2) | 3,497 (33.9) | 948 (48.3) |
| WTC exposure | |||
| 9/11 a.m. | 2,076 (16.9) | 1,672 (16.2) | 404 (20.6) |
| 9/11 p.m. | 6,028 (49.2) | 5,444 (52.8) | 584 (29.8) |
| 9/12 | 2,050 (16.7) | 1,794 (17.4) | 256 (13.0) |
| 9/13–9/24 | 1,793 (14.6) | 1,264 (12.3) | 529 (26.9) |
| 9/25 to site close | 275 (2.2) | 87 (0.8) | 188 (9.6) |
| Unknown | 42 (0.3) | 40 (0.4) | 2 (0.1) |
Definition of abbreviations: EMS = emergency medical service providers; PFT = pulmonary function test; WTC = World Trade Center.
Values presented as mean ± SD where applicable. Values in parentheses are percentages.