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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