Table 1.

Classification of Adult Cases With COVID-19 (11)

Classification	Characteristics
Mild	Clinical symptoms mild
	No sign of pneumonia on imaging
Moderate	Radiological findings of pneumonia fever and respiratory symptoms
Severe	Oxygen saturation ≤93% at rest
	Arterial partial pressure of oxygen (PaO2)/fraction of inspired oxygen (FiO2)
	≦300 mmHg (l mmHg = 0.133 kPa)
	Obvious lesion progression in chest images within 24–48 h >50%
Critical	Respiratory failure and requiring mechanical ventilation
	Shock with another organ failure that requires ICU care

Abbreviation: ICU, intensive care unit.