| AHI | Apnea Hypopnea Index |
| ANOVA | Analyses of variance |
| ATC | Anatomical Therapeutic Chemical |
| BMI | Body Mass Index |
| CAT | COPD Assessment Test |
| CI | Cognitive Impairment |
| COPD | Chronic Obstructive Pulmonary Disease |
| CRM | CardioRespiratory Monitor |
| CRT | Continuous Reaction Time test |
| FEV1 | Forced expiratory volume in 1 s |
| FVC | Forced vital capacity |
| GOLD | Global initiative for chronic Obstructive Lung Disease |
| HADS | Hospital Anxiety and Depression Scale |
| IQR | Interquartile Range |
| mMRC | Modified Medical Research Council breathlessness |
| MMSE | Mini-Mental State Examination |
| MoCA | Montreal Cognitive Assessment |
| OPEN | Open Patient data Explorative Network |
| OSA | Obstructive Sleep Apnea |
| PaCO2 | Partial pressure of carbon dioxide |
| PaO2 | Partial pressure of oxygen |
| SaO2 | Arterial oxygen saturation |
| SD | Standard deviation |
| T90 | Percentage of sleep with oxygen saturation under 90% |
| 6MWT | 6-min walk test |
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