Table 3.

ROC Curve Data

Characteristic	NLR	Leukocyte	CRP	PCT
Cutoff value	>8.9	>8.05	>17	>0.11
Sensitivity, %	0.688	0.688	0.688	0.531
Specificity, %	0.886	0.683	0.626	0.805
Positive predictive value, %	0.609	0.316	0.304	0.405
Negative predictive value, %	0.940	0.902	0.893	0.863
Diagnostic accuracy	0.868	0.684	0.660	0.742
Likelihood ratio of positive test	7.123	2.120	1.922	2.596
Likelihood ratio of negative test	0.294	0.496	0.530	0.605
Youden’s index	0.574	0.371	0.314	0.336
AUC	0.858	0.723	0.670	0.719
95% CI	0.785–0.931	0.623–0.823	0.567–0.773	0.615–0.823

Abbreviations: ROC, receiver-operating characteristic; AUC, area under the curve; CI, confidence interval; NLR, neutrophil/lymphocyte ratio; CRP, C-reactive protein; PCT, procalcitonin.