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New York Heart Association Functional Class: COPD Versus No COPD (n = 372)
| Class | COPD | No COPD |
|---|---|---|
| I | 12 (18%) | 88 (29%) |
| II | 29 (43%) | 138 (45%) |
| III | 25 (37%) | 66 (22%) |
| IV | 1 (2%) | 13 (4%) |
NOTE: Wilcoxon rank sum test, P = 0.03.
Abbreviation: COPD, chronic obstructive pulmonary disease.
