TABLE 1.
DEMOGRAPHIC CHARACTERISTICS OF FDNY COHORT BY ARRIVAL TIME–BASED WORLD TRADE CENTER EXPOSURE
| Characteristic | Early Exposure | Intermediate Exposure | Late Exposure | Nonexposed | Total |
|---|---|---|---|---|---|
| Demographics | |||||
| Number (% of FDNY cohort) | 1,660 (13.7) | 8,185 (67.8) | 1,921 (15.9) | 313 (2.6) | 12,079 (100) |
| Age on 09/11/01, yr | 40 ± 7.6 | 39.7 ± 7.5 | 40.2 ± 8.3* | 40.7 ± 9† | 39.7 ± 7.7 |
| Height, cm | 179.3 ± 7.6 | 179.6 ± 7.4 | 178.3 ± 8.4* | 174 ± 9.1‡ | 178.3 ± 7.6 |
| Sex, % male | 96.7 | 97.1 | 91.9* | 71.2‡ | 95.6 |
| Race, % white | 86.2 | 88.3 | 78.2* | 55.3‡ | 85.6 |
| Ever smokers, % | 28.9 | 27.5 | 33.4* | 39.9‡ | 29 |
| Work assignment on 09/11/01, % EMS | 18.1 | 13.8 | 33* | 88.8‡ | 19.4 |
| FDNY tenure on 09/11/01, yr | 11.2 ± 7.9 | 11.1 ± 7.9 | 10.4 ± 8.3* | 6.4 ± 5.3‡ | 10.9 ± 8.3 |
Definition of abbreviations: EMS = emergency medical service; FDNY = Fire Department of New York City; WTC = World Trade Center.
*
p < 0.05 among early-, intermediate-, and late-exposure groups (analysis of variance for age, height, and FDNY tenure; χ2 for sex, race, and ever smoking).
†
p = 0.006 among early-, intermediate-, late-, and nonexposed groups (analysis of variance).
‡
p < 0.001 among early-, intermediate-, late-, and nonexposed groups (analysis of variance for height and FDNY tenure; χ2 for sex, race, and ever smoking).