Fig.  2

Single or combination analysis of indexes during hospitalization in mild vs. severe cases using different cut-off values. Using the cut-off value as 1, 2, or 3 × ULN, respectively, the differences of the overall distribution and the abnormal rates of liver function indexes between the two groups were analyzed. Most of the elevated liver function index were less than 3 × ULN. The abnormality of 2 or more indexes is low in the patients with COVID-19, but it is more likely to occur in the severe group