Table 1:
Characteristics of the study population, and the three spirometrically defined subgroups.
| Variable* | All Participants | Normal | Low FVC | COPD | |
|---|---|---|---|---|---|
| n | 640 | 414 | 167 | 59 | |
| LAV% | median | 0.05 (0–0.42) | 0.05 (0–0.45) | 0.02 (0–0.10) | 0.87 (0.14–4.11) |
| >2.5% | 37 (6) | 20 (5) | 3 (2) | 14 (24) | |
| WAP | median | 61.9 (56–41) | 60.5 (56–66) | 64.6 (59–68) | 64.9 (60–72) |
| MLAEI | median | 83.0 (78–87) | 83.0 (78–86) | 81.0 (75–85) | 88.2 (85–92) |
| >87.4% | 45 (7) | 25 (6) | 7 (4) | 13 (22) | |
| Age | years | 45 (9) | 45 (9) | 46 (9) | 50 (9) |
| Sex | male | 538 (84) | 339 (82) | 146 (87) | 53 (90) |
| female | 102 (16) | 87 (18) | 21 (13) | 6 (10) | |
| BMI | kg/m2 | 29.1 (4.5) | 28.6 (4.0) | 30.5 (5.5) | 28.3 (4.4) |
| Race/ethnicity | non-Latino white | 342 (53) | 223 (54) | 79 (47) | 40 (68) |
| Latino | 238 (37) | 159 (38) | 67 (40) | 12 (20) | |
| non-Latino black/other | 60 (9) | 32 (8) | 21 (13) | 7 (12) | |
| Occupation | Management/services | 108 (18) | 59 (15) | 35 (21) | 14 (24) |
| Construction trades | 114 (19) | 69 (18) | 35 (21) | 10 (17) | |
| Laborers/cleaners | 206 (34) | 170 (44) | 22 (13) | 14 (24) | |
| Production/Transportation | 28 (5) | 16 (4) | 9 (5) | 3 (5) | |
| Law enforcement | 156 (25) | 75 (19) | 63 (38) | 18 (31) | |
| Arrival at | < 48 hours | 308 (48) | 164 (41) | 106 (63) | 38 (64) |
| WTC site | > 48 hours | 332 (52) | 250 (60) | 61 (37) | 21 (36) |
| BDR | at any visit | 92 (14) | 0 (0) | 48 (29) | 44 (75) |
| Smoking | Never | 350 (55) | 233 (56) | 99 (59) | 18 (31) |
| Current | 112 (18) | 67 (16) | 26 (16) | 19 (32) | |
| Former | 178 (28) | 114 (28) | 42 (27) | 22 (37) | |
| Smoking | pack-years | 7 (13) | 5 (11) | 6 (11) | 21 (24) |
*
Presented as n (%), mean (SD), or median (IQR), as appropriate