Fig. 2

Receiver operating characteristics curve of procalcitonin (PCT) (a) and temperature (b) at admission. For PCT, the area under curve (AUC) was 0.87 with optimal cutoff at 1.44 ng/mL leading to a sensitivity and specificity of 0.90 (IC95 [0.75–1.00]) and 0.76 (IC95 [0.66–0.84]), respectively. Positive and negative likelihood ratios were 3.75 and 0.13, respectively. For temperature, the area under curve (AUC) was 0.66 with optimal cutoff at 36.8 °C leading to a sensitivity and specificity of 0.65 (IC95 [0.45–0.85]) and 0.65 (IC95 [0.56–0.75]), respectively. Positive and negative likelihood ratios were 1.86 and 0.54, respectively