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Demographic variables
| Variable | Number (% of total) |
|---|---|
| Age (years) | |
| 49–64 | 128 (14.6) |
| 65–74 | 203 (23.2) |
| 75–84 | 330 (37.7) |
| ≥85 | 214 (24.5) |
| Race | |
| Caucasian | 837 (95.3) |
| Non-Caucasian | 41 (4.7) |
| Gender | |
| Male | 869 (99) |
| Female | 9 (1) |
| COPD severity | |
| Mild (FEV1 ≥ 80%) | 86 (9.8) |
| Moderate (FEV1 50%–80%) | 379 (43.2) |
| Severe (FEV1 30%–50%) | 292 (33.3) |
| Very severe (FEV1 ≤30%) | 121 (13.8) |
Abbreviation: COPD, chronic obstructive pulmonary disease.
