| ARDS | Acute respiratory distress syndrome |
| ETI | Endotracheal intubation |
| HFNO | High-flow nasal oxygen cannula |
| ICU | Intensive Care Unit |
| IQR | Interquartile ranges |
| MV | Invasive mechanical ventilation |
| NIV | Non-invasive ventilation |
| Rt-PCR | Reverse transcriptase-polymerase chain reaction |
| SD | Standard deviations |
| SpO2 | O2 saturation |
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