CALCA and Sepsis: The PCT level in the sepsis group was positively correlated with IL-6 (r = 0.289, p = 0.015), while it was not correlated with WBC, CRP, SAA, APACHE II, and the SOFA score (r = 0.225, p = 0.061; r = 0.163, p = 0.178; r = 0.220, p = 0.067; r = 0.203, p = 0.093; and r = 0.009, p = 0.944, respectively), which is shown in Figure 4.