CALCA and bacterial infectious disease: The AUC values of PCT, neutrophil percentage, and lymphocyte percentage for predicting bacterial infection were 0.618 (95% CI 0.524–0.711, p = 0.016), 0.639 (95% CI 0.550–0.729, p = 0.005) and 0.651 (95% CI 0.563–0.740, p = 0.002), respectively (Table 5, Figure 2).