| SGRQ | St. George’s Respiratory Questionnaire |
| AATD | alpha-1 antitrypsin deficiency |
| COPD | chronic obstructive pulmonary disease |
| PD-15 | 15th percentile lung density |
| HU-950 | lung volume with density less than −950 Hounsfield Units |
| mMRC | modified Medical Research Council dyspnea scale |
| FEV1 | forced expiratory volume in 1 s |
| DLCO | diffusing capacity of the lung for carbon monoxide |
| KCO | transfer coefficient for carbon monoxide |
| PYI | pack-year index. |
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