3. Statistics analysis
Categorical variables were described using frequencies and percentages, and continuous variables were described using median, minimum and maximum. Shapiro-Wilk test is used to test whether the data conform to a normal distribution. The degree of SARS-CoV-2-induced hemolysis compared with the literature was examined by Mann-Whitney U test. Paired samples conformed to a normal distribution use paired sample T test, otherwise Wilcoxon test is used for examination. All of the analyses were performed using the statistical package SPSS 26.0, p<0.05 was considered statistically significant.