| CCI | Charlson Comorbidity Index |
| COVID-19 | Coronavirus disease—2019 |
| CRP | C-reactive protein |
| LDH | Lactate dehydrogenase |
| SARS-CoV-2 | Severe-acute respiratory syndrome coronavirus-2 |
| SD | Standard deviation |
| SpO2 | Oxygenic saturation at atmosphere air |
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