Fig. 2

Serum-S1P concentrations in controls and sepsis patients. Bars indicate the median and interquartile range. Mann–Whitney U test was used to compare controls versus the entire patient cohort (All patients), and analysis-of-variance Kruskal-Wallis test was used for comparisons between the three patient groups (*P <0.01). n.s. non-significant, S1P sphingosine-1-phosphate, SIRS systemic inflammatory response syndrome