| COPD | Chronic Obstructive Pulmonary Disease |
| HADS | Hospital Anxiety and Depression Scale |
| HAD-A | Hospital Anxiety and Depression—Anxiety Subscale |
| HAD-D | Hospital Anxiety and Depression—Depression Subscale |
| FEV1 | Forced Expiratory Volume in the First Second |
| FVC | Forced Vital Capacity |
| FEF25–75% | Forced Expiratory Flow at 25–75 of the Vital Capacity |
| BMI | Body Mass Index |
| mMRC Dyspnea Scale | Modified Medical Research Council Dyspnea Scale |
| CAT | COPD Assessment Test |
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