Table 2.

Criteria for clinical severity of confirmed COVID‐19 pneumonia

Patient	Clinical findings	CT (imaging findings of pneumonia)	Organ damage
Mild	Negative	None	None
	No dyspnea, with or without cough, fever <38°C (quelled without treatment)
	No history of chronic respiratory disease
Moderate	dyspnea, with or without cough	Multifocal patchy GGOs with subpleural distribution	None
	SpO2 >93% without oxygen inhalation
Severe	Fever	Diffuse heterogeneous consolidation with GGO,	None
	Muscle ache	Rapid progression (>50%) on CT imaging within 24–48 hr
	Headache
	Confusion
	Respiratory distress:
	RR ≥ 30 times/min
	SpO2 < 93% at rest
	PaO2/FiO2 ≤ 300 mmHg
Critical	Shock		“Extra pulmonary” organ failure or MODS
	Respiratory failure
	need mechanical assistance
	Intensive care unit is needed

Abbreviations: FiO2, fraction of inspired oxygen; GGO, ground‐glass opacity; MODS, multiple organ dysfunction syndrome; PaO2, partial pressure of oxygen; RR, respiratory rate, SpO2, oxygen saturation.