Predictor Variables
Patient age, sex, body-mass index, comorbidities, antiviral agent treatment and laboratory test results on admission were extracted. The total number of comorbidities were evaluated included hypertension, diabetes mellitus, cardiovascular disease, nervous system diseases, respiratory disease and others (arthrolithiasis, hepatitis B, renal failure, and rheumatoid). Electrocardiogram abnormalities included sinus tachycardia, ST elevation up or depression, Premature atrial contraction, T-wave inversion, and P pulmonale).Patient medical costs were also evaluated.