CRP and infection: Using those, PSP (AUC 0.80, 95%CI [0.75–0.85]) and PCT (AUC 0.79, 95%CI [0.74–0.84]) performed better that CRP (in stratifying patient according to infection severity: AUC was lowest for CRP (AUC 0.56, 95%CI [0.50–0.63]).