PCSK9 and Sepsis: When Pearson’s and Spearman’s correlations were done to study the associations between length of stay of the surviving children in the two-sepsis groups and PCSK9 and LDL-C levels, we found a significant positive association between length of hospital stay and PCSK9 level (r = 0.67, p = 0.001) (Fig. 1), while the association between length of hospital stay and LDL-C was of statistical insignificance (r = − 0.4, p = 0.8).