Table 1.
Study population characteristics
| Characteristic | Total Population | Deaths |
|---|---|---|
| N (%) | N (%) | |
| Total | 15,431 (100) | 546 (100) |
| Person-years of follow-up | 248,664.50 | 5977.9 (100) |
| Age on 9/11/2001, median (IQR) | 39.9 (33.6–46.2) | 47.7 (41.9–57.1) |
| BMI (kg/m2) at end of follow-up, mean (SD) 1 | 30.5 (5.0) | 30.2 (6.2) |
| Year hired, mean (SD) | 1988 (10) | 1980 (12) |
| WTC exposure Level | ||
| High | 2370 (15.4) | 86 (15.8) |
| Moderate | 9808 (63.6) | 294 (53.9) |
| Low | 3253 (21.1) | 166 (30.4) |
| Race/ethnicity | ||
| non-Hispanic white | 13,456 (87.2) | 468 (85.7) |
| Non-white 2 | 1975 (12.8) | 78 (14.3) |
| Work assignment | ||
| Firefighter | 13,266 (86.0) | 455 (83.3) |
| Emergency medical service providers | 2165 (14.0) | 91 (16.7) |
| Sex | ||
| Male | 14,943 (96.8) | 532 (97.4) |
| Female | 488 (3.2) | 14 (2.6) |
| Smoking status | ||
| Never smoker | 9397 (60.9) | 215 (39.4) |
| Ever smoker | 5742 (37.2) | 277 (50.7) |
| Unknown | 292 (1.9) | 54 (9.9) |
| Age at death, median (IQR) | N/A | 58.9 (51.6–68.5) |
| Years to death post-9/11/2001, median (IQR) | N/A | 11.6 (8.7–14.0) |
Abbreviations: interquartile range (IQR), body mass index (BMI), World Trade Center (WTC). 1 Body mass index data only available for n = 15,072 in the total population and n = 484 among the deceased. 2 Non-Hispanic black, Hispanic, other.