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WHO 7‐points scale: inverted
| 1: | Not hospitalized without limitation in activity |
| 2: | Not hospitalized with limitation in activity |
| 3: | Hospitalized not on supplemental oxygen |
| 4: | Hospitalized on supplemental oxygen |
| 5: | Hospitalized on noninvasive ventilation or high flow nasal cannula |
| 6: | Hospitalized on invasive mechanical ventilation or ECMO |
| 7: | Death |
