Table 1:

Categorization of moderate, severe and critical patients in COMET and SFGH cohorts.

NIH ordinal scale	WHO criteria	categorization: COMET cohort	categorization: SFGH cohort
1	Not hospitalized, no limitations on activities	n/a	moderate
2	Not hospitalized, limitation on activities and/or requiring home oxygen	n/a	moderate
3	Hospitalized, not requiring supplemental oxygen – no longer requires ongoing medical care	moderate	moderate
4	Hospitalized, not requiring supplemental oxygen – requiring ongoing medical care	moderate	moderate
5	Hospitalized, requiring supplemental oxygen	severe	severe (oxygenation level information not available)
6	Hospitalized, on non-invasive ventilation or high flow oxygen devices	severe
7	Hospitalized, on mechanical ventilation or ECMO	critical	critical