Table 1.

Clinical characteristics of the severe patients with COVID-19

Variables	Training dataset (China data) n = 96	Test dataset (Iran data) n = 43	P value
Age (years), mean (SE)	63.47 (1.36)	63.37 (2.70)	0.972
Male, n (%)	49 (51.0)	30 (69.8)	0.039
Smoking history, n (%)	1 (1.0)	2 (4.7)	0.064
Symptoms on admission, n (%)
Fever	86 (89.6)	20 (46.5)	< 0.001
Cough	78 (81.3)	23 (53.5)	0.222
Fatigue	86 (89.6)	27 (42.2)	< 0.001
Shortness of breath	70 (72.9)	24 (55.8)	0.983
Headache	17 (17.7)	4 (9.3)	0.453
Diarrhea	20 (20.8)	1 (2.3)	0.017
Coexisting disorder, n (%)
Hypertension	33 (34.4)	12 (27.9)	0.748
Diabetes	16 (16.7)	8 (18.6)	0.296
Chronic obstructive pulmonary disease	3 (3.1)	2 (4.7)	0.444
Cerebral infarction	1 (1.0)	1 (2.3)	0.42
Coronary heart disease	10 (10.4)	0	0.057
Chronic kidney disease	3 (3.1)	1 (2.3)	0.768
Chronic liver disease	0	0	–
Respiratory rate, mean (SE)	27.24 (0.57)	22.76 (1.09)	< 0.001
Heart rate, mean (SE)	92.89 (1.749)	90.34 (1.88)	0.323
In-hospital deaths, n (%)	31 (32.3)	13 (30.2)	0.809