Table 2.

Ordinal scale for clinical improvement.

	Patient state	Descriptor	Score
1	Uninfected	Uninfected; no viral RNA detected	0
2	Ambulatory	No limitation activities	1
		Limitation of activities	2
3	Hospitalized mild disease	Hospitalized; no oxygen therapy	3
		Oxygen by mask or nasal prongs	4
4	Hospitalized severe disease	Noninvasive ventilation or high-flow oxygen	5
		Intubation or mechanical ventilation	6
		Ventilation + additional organ support-pressors, RRT, and ECMO	7
5	Dead	Death	8

RNA: ribonucleic acid; RRT: renal replacement therapy; ECMO: extracorporeal membrane oxygenation.