Table. 4.

Definitions for different COVID-19 patient's categories according to clinical parameters.

Categories	Fever	Cough	Dyspnea	Fast Breathing	Chest X-ray	Oxygen Saturation	Mechanical ventilation
Mild			×	× (Respiratory rate<22 breath per min)	No evidence of pneumonia	>94%	×
Moderate				(Respiratory rate<30 breath per min)	Evidence of pneumonia (not severe)	90%-94%	×
Severe				(Respiratory rate> 30 breath per min	Evidence of severe pneumonia.	< 90%	×
Critical				(Respiratory rate> 30 breath per min	Bilateral opacities, lung collapse, may occur	<85%