Table 1.

Diagnostic performance of PCT ≥ 0.5 ng/mL for non-COVID-19 pneumonia vs COVID-19 pneumonia

TP	12
FP	9
TN	23
FN	16
Overall accuracy	58.3% (44.9–70.9%)
Sen % (95% CI)	42.9% (24.5–62.8%)
Spec % (95% CI)	71.9% (53.3–86.3%)
PPV % (95% CI)	57.2% (39.9–72.9%)
NPV % (95% CI)	60% (49.4–67.9%)
+ LR (95% CI)	1.52 (0.76–3.07)
− LR (95% CI)	0.8 (0.54–1.17)

TP true positive, FP false positive, TN true negative, FN false negative, Sen sensitivity, Spec specificity, NPV negative predictive value, PPV positive predictive value,  + LR positive likelihood ratio, − LR negative likelihood ratio, 95% CI 95% confidence interval