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Table 3 Diagnostic accuracy of PEC index and its components for SBP diagnosis and for distinguishing culture-negative SBP from sterile ascites, using ROC statistics

From: A novel serum index for accurate diagnosis of spontaneous bacterial peritonitis in cirrhotic patients without other infections

Serum markers SBP diagnosis Discrimination between culture-negative SBP and sterile ascites
Cutoff value Sensitivity Specificity AUC
(95% CI)
P Cutoff value Sensitivity Specificity AUC
(95% CI)
P
PCT ng/mL > 0.590 81.67% 93.33% 0.879
0.809–0.948
< 0.001 > 0.305 85.70% 72.90% 0.825
0.742–0.907
< 0.001
ESR mm/hour > 27.0 73.33% 61.67% 0.679
0.581–0.776
< 0.001 > 27.0 68.60% 61.00% 0.649
0.521–0.776
0.008
CRP mg/L > 21.0 93.33% 51.67% 0.736
0.639–0.833
< 0.001 > 23.5 80.00% 64.40% 0.704
0.613–0.794
< 0.001
PEC index > 20.0 98.33% 96.67% 0.977
0.940–0.996
< 0.001 > 20.0 97.10% 96.60% 0.970
0.934–1.0
< 0.001
  1. ROC receiver operating characteristic, PCT procalcitonin, ESR erythrocyte sedimentation rate, CRP C-reactive protein, AUC area under the curve, CI confidence interval