Table 3.
Comparison of COPD patients according to the handheld spirometry with cut-off value of FEV1/FEV6 ≤ 0.73a
| Characteristic | FEV1/FEV6 > 73% (n = 21) | FEV1/FEV6 ≤ 73% (n = 118) | p value |
|---|---|---|---|
| Age, yr | 68.8 ± 7.7 | 68.7 ± 9.4 | 0.971 |
| Smoking amount, pack-year | 34.0 ± 15.7 | 34.3 ± 24.7 | 0.964 |
| Presence of respiratory symptom | |||
| Cough | 8 (7.3) | 21 (21.7) | 0.737 |
| Sputum | 8 (10.8) | 35 (32.3) | 0.242 |
| Dyspnea | 16 (16.6) | 50 (49.4) | 0.805 |
| Result of conventional spirometry, % | |||
| Prebronchodilator FEV1 of predicted value | 84.4 ± 17.3 | 62.6 ± 18.3 | < 0.001b |
| Prebronchodilator FEV1/FVC | 64.6 ± 3.6 | 51.8 ± 11.4 | < 0.001b |
| Postbronchodilator FEV1 of predicted value | 86.5 ± 17.5 | 65.4 ± 18.0 | < 0.001b |
| Postbronchodilator FEV1/FVC | 66.2 ± 3.9 | 53.8 ± 11.4 | < 0.001b |
Values are presented as mean ± SD or number (%). Normal range of FEV1 of predicted value is equal to or greater than 80%.
COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in 1 second; FEV6, forced expiratory volume in 6 seconds; FVC, forced vital capacity.
a
COPD patients were confirmed by conventional spirometry.
b
Statistically significanct.