Table 1.
Baseline demographics and clinical characteristics
| N | 66 |
| Age, years | 69.4 (60–77) |
| Race | |
| White | 61 (92) |
| African–American | 4 (6) |
| Other | 1 (2) |
| Female | 31 (47) |
| FEV1/FVC ratio | 0.49 (0.41–0.58) |
| FEV1 absolute, L | 1.35 (1.04–1.69) |
| FEV1 % predicted | 51.3 (41.0–64.1) |
| FVC absolute, L | 2.80 (2.27–3.57) |
| FVC % predicted | 78.4 (70.8–94.0) |
| PIFR from standard spirometer, L/min | 172 (121–215) |
| GOLD stage | |
| 1 | 5 (8) |
| 2 | 30 (45) |
| 3 | 23 (35) |
| 4 | 8 (12) |
| CAT score | 16.5 (12–24) |
| CAT score ≥10 | 58 (88) |
Note: All values are given as n (%) or median (IQR).
Abbreviations: GOLD, Global Initiative for Obstructive Lung Disease; CAT, COPD assessment test; PIFR, peak inspiratory flow rate.