Table 1.
Demographic, Clinical, and Physiologic Characteristics of the 148 COPD Patients in the Study, Measured at Recruitment
| Characteristics | Median | % | IQR |
|---|---|---|---|
| Age, yr | 68.5 | 62.6 to 73.7 | |
| FEV1, L | 0.98 | 0.73 to 1.30 | |
| FEV1, % predicted | 38.5 | 27.7 to 50.3 | |
| FEV1, % reversibility | 5.45 | 0.00 to 12.6 | |
| FVC, L | 2.44 | 1.81 to 2.93 | |
| FEV1/FVC, % | 42.3 | 33.5 to 53.1 | |
| Peak expiratory flow, L/min | 174 | 137 to 250 | |
| Pao2, kPa | 9.0 | 8.23 to 9.58 | |
| Paco2, kPa | 5.8 | 5.40 to 6.35 | |
| Smoking history, yr | 42 | 32 to 50 | |
| Male gender | 67.6 | ||
| Chronic dyspnea* | 47.3 | ||
| Chronic wheeze* | 31.1 | ||
| Chronic cough* | 46.0 | ||
| Chronic sputum production* | 52.7 | ||
| History of smoking | 95.6 | ||
| Smoking at recruitment | 32.8 |
*
Chronic refers to symptoms experienced all day or every morning.