Table 1.

Clinical categorization of the patients with COVID-19 pneumonia by National Health Commission of China.

Common	Severe	Critical
	Meet any of the followings:	Meet any of the followings:
Fever	1. Respiratory distress, RR ≥30/min	1. Respiratory failure and mechanical ventilation
Respiratory symptoms	2. Saturation of oxygen ≤93% at rest state	2. Shock
Pneumonia on X-ray or CT	3. Arterial partial pressure of oxygen (PaO2) or Fraction of inspiration O2 (FiO2) ≤300 mnHg (1 mmHg = 0.133 kPa)	3. Other organ failure and ICU monitoring and treatment