TABLE 4.
Variable | n | COPD | No COPD | P Value |
---|---|---|---|---|
Pulmonary function testing | ||||
Forced vital capacity, % predicted | 373 | 85 ± 19 | 85 ± 16 | 0.71 |
Forced expiratory volume in 1 second, % predicted | 373 | 69 ± 19 | 86 ± 16 | <0.0001 |
Forced expiratory volume in 1 second/forced vital capacity | 373 | 62 ± 8 | 79 ± 5 | <0.0001 |
DLCOcorr, % predicted | 355 | 55 ± 13 | 60 ± 17 | 0.02 |
Arterial blood gas | ||||
pH | 333 | 7.44 ± 0.03 | 7.44 ± 0.04 | 0.79 |
pCO2, mm Hg | 333 | 34 ± 5 | 35 ± 5 | 0.69 |
pO2, mm Hg | 333 | 81 ± 12 | 85 ± 16 | 0.11 |
Oxygen saturation, % | 326 | 94 ± 3 | 95 ± 4 | 0.72 |
Alveolar-arterial oxygen gradient, mm Hg | 333 | 24 (13–31) | 15 (7–26) | 0.003 |
NOTE: Data are shown as mean ± standard deviation, median (interquartile range), or n (%).
Abbreviations: COPD, chronic obstructive pulmonary disease; DLCOcorr, diffusing capacity for carbon monoxide corrected for hemoglobin; pCO2, partial pressure of carbon dioxide; pO2, partial pressure of oxygen.