TABLE 1.

Clinical characteristics of patients

	Training set	Validation 1	Validation 2	Validation 3	Validation 4
Subjects	709	226	161	53	117
City or province	Wuhan city and Henan	Anhui	Heilongjiang	Beijing	Huangshi city
Type
COVID-19	560	102	92	53	117
Bacterial pneumonia	127	119	25	0	0
Mycoplasma pneumonia	11	5	15	0	0
Viral pneumonia	0	0	29	0	0
Fungal pneumonia	11	0	0	0	0
Sex
Male	337	131	108	25	60
Female	372	95	53	28	57
Age years	50.52±18.91	49.15±18.44	58.44±16.19	50.26±19.29	47.67±14.20
Comorbidity
Any	204	NA	NA	16	27
Diabetes	45			2	12
Hypertension	120			10	12
Cerebrovascular disease	18			1	0
Cardiovascular disease	21			5	9
Malignancy	19			0	1
COPD	10			1	2
Pulmonary tuberculosis	6			1	0
Chronic kidney disease	10			0	2
Chronic liver disease	16			3	2
Follow-up >5 days	301	NA	NA	53	117

Data are presented as n or mean±sd. COVID: coronavirus 2019: NA: not available.