Comparison of serum MMP3 between infected group and non-infected group
Normality tests indicated that data from both the novel coronavirus pneumonia infected group and the non-infected group were not normal. Therefore, the Wilcoxon rank sum test was used to compare the 2 groups. The MMP3 serum levels in the infected and non-infected groups are shown (Table 1). MMP3 concentrations were 44.44(23.46~72.12)ng/ml in the infected group and 32.42(28.16~41.21)ng/ml in the non-infected group. A positive correlation was found between infected and non-infected groups (Z=-2.799, P=0.005<0.05). The distribution of MMP-3 and the statistical significance between the 2 groups were plotted using a quartile box (Fig. 1).