Table 1.
Selected Characteristics of the FDNY Study Participants, Invitees Who Did Not Participate, and the Source Population
| Characteristics | Eligibles (n = 380) |
Source Populationa N = 12,948 |
|
|---|---|---|---|
| Participants n = 173 |
Nonparticipants n = 207 |
||
| WTC Exposure, No. (%) | |||
| High exposure | 51 (29.5) | 61 (29.5) | 1,928 (14.9) |
| Moderate exposure | 105 (60.7) | 136 (65.7) | 9,944 (68.3) |
| Low exposure | 17 (9.8) | 10 (4.8) | 2,176 (16.8) |
| Race, No. (%) | |||
| White | 165 (95.4) | 200 (96.6) | 12,014 (92.8) |
| African American | 8 (4.6) | 7 (3.4) | 366 (2.8) |
| Other | 0 (0.0) | 0 (0.0) | 568 (4.4) |
| Smoking status | |||
| Current | 11 (6.4) | 17 (8.2) | 706 (5.5) |
| Former | 31 (17.9) | 70 (33.8) | 4,384 (33.9) |
| Never | 131 (75.7) | 120 (58.0) | 7,361 (58.6) |
| Missing | 0 (0.0) | 0 (0.0) | 262 (2.0) |
| Duty status by 2013-2014 | |||
| Active | 41 (23.7) | 22 (10.6) | 5,428 (41.9) |
| Retired | 132 (76.3) | 185 (89.4) | 7,347 (56.7) |
| Age at 9/11, mean (SD) | 42.6 (7.0) | 43.3 (6.6) | 41.0 (9.5) |
| Height (cm), mean (SD) | 177.9 (6.5) | 178 (6.8) | |
| Pre-9/11 FEV1 (mL), mean (SD) | 4,280 (670) | 4,200 (600) | 4,390 (810) |
| Pre-9/11 FEV1 (% predicted), mean (SD) | 103.0 (13.2) | 101.8 (12.1) | 102.9 (19.2) |
| Trans-9/11 change FEV1 (mL), mean (SD) | −399.0 (−468.3) | −521.01 (−491) | −377 (−650) |
| BHR in 2001-2003, No. (%) | 28 (16%) | 52 (25%) | N/A |
| Years between early and late post-9/11 PFT, mean (SD) | 11.5 (0.5) | N/A | N/A |
| Past or present atopy | 92 (53.2) | N/A | N/A |
BHR = bronchial hyperreactivity; FDNY = Fire Department of the City of New York; N/A = not applicable; WTC = World Trade Center.
a
Source population = male firefighters exposed to WTC in the first 2 wk.