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Clinical features of COPD patients and controls.
| COPD | Control | t value | P value | |||
|---|---|---|---|---|---|---|
| Mean | SD | Mean | SD | |||
| FEV1/FVC (%) | 54.47 | 6.62 | 95.1 | 8.91 | −20.048 | 0.000 |
| 6MWT (ft) | 515.4 | 127.15 | 803.33 | 99.16 | −9.7805 | 0.000 |
FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; 6MWT: 6-minute walk test.
