TABLE 1.
Characteristics of participants enrolled in the COPD study, Buffalo, NY, April 1994 to June 2014
| Characteristica | No. (%) or mean ± SD (n = 181) |
|---|---|
| Age (yr) | 67 ± 9.2 |
| Race | |
| White | 159 (88) |
| Black | 22 (12) |
| Smoking status | |
| Former smoker | 121 (67) |
| Current smoker | 60 (33) |
| Pack-yr of smoking | 79 ± 36 |
| FEV1 (liters) | 1.64 ± 0.68 |
| FEV1 (% predicted) | 49 ± 18 |
| Charlson comorbidity index | 4.2 ± 1.5 |
| Duration in study (yr) | 4.5 ± 4.0 |
| Median (IQR) | 3.5 (1.5, 5.8) |
| Antibiotic use between clinic visits | |
| None | 7,078 (80) |
| Any | 1,765 (20) |
a
IQR, interquartile range.