Table 1.
Baseline characteristics of participants with and without expiratory central airway collapse
| Variable | Overall (N = 1,320) | Control Subjects (n = 880) | ECAC (n = 440) |
|---|---|---|---|
| Age, yr | 62.8 (9.0) | 61.7 (8.9) | 65.0 (8.6) |
| Male sex, % | 558 (42.3) | 413 (46.9) | 145 (33.0) |
| African American race, % | 233 (17.7) | 166 (18.9) | 67 (15.2) |
| Body mass index, kg/m2 | 29.7 (6.6) | 28.9 (6.4) | 31.2 (6.6) |
| Pack-years of smoking | 47.3 (27.8) | 47.0 (28.3) | 47.9 (26.7) |
| Current smoker, % | 459 (34.8) | 336 (38.2) | 123 (28.0%) |
| FEV1, L | 1.98 (0.87) | 2.05 (0.90) | 1.82 (0.79) |
| FEV1% predicted | 71.2 (26.7) | 71.7 (27.1) | 70.2 (25.8) |
| FVC, L | 3.0 (1.0) | 3.2 (1.0) | 2.8 (0.9) |
| FVC% predicted | 83.7 (19.3) | 84.2 (19.5) | 82.6 (18.8) |
| FEV1/FVC | 0.64 (0.17) | 0.64 (0.17) | 0.63 (0.17) |
Definition of abbreviations: ECAC = expiratory central airway collapse; FEV1 = forced expiratory volume in 1 second; FVC = forced vital capacity.
All values expressed as mean (standard deviation) or as n (%) where indicated.