| ARF | Acute respiratory failure |
| CRF | Chronic respiratory failure |
| ECOPD | COPD exacerbations |
| COPD | Chronic obstructive pulmonary disease |
| LTOT | Long-term oxygen therapy |
| RWD | Real-world data |
| RCT | Randomised controlled trial |
| TriNetX | TriNetX Analytics Network |
| HCOs | Healthcare organisations |
| BMI | Body mass index |
| ICD | International Classification of Diseases |
| ICD-10 procedures | ICD-10-Procedure Coding System |
| KM | Kaplan–Meier |
| IQR | Interquartile range |
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