Table 1 Eight-point ordinal scale

1

Death

2

Hospitalized, requiring invasive mechanical ventilation or ECMO

3

Hospitalized, requiring non-invasive mechanical ventilation or high-flow supplemental oxygen

4

Hospitalized, requiring low-flow supplemental oxygen

5

Hospitalized, not requiring supplemental oxygen but requiring ongoing medical care

6

Hospitalized, not requiring supplemental oxygen or ongoing medical care

7

Discharged, requiring supplemental oxygen

8

Discharged, not requiring supplemental oxygen