| COPD | Chronic obstructive pulmonary disease |
| FOT | Force oscillation technique |
| IOS | Impulse oscillometry |
| FEV1 | First second of forced expiration |
| FVC | Forced vital capacity |
| R5Hz | Respiratory resistance |
| X5Hz | Lung reactance |
| D5-20% | peripheral airway resistance |
| AX | Reactance area |
| Fres. | Resonant frequency |
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