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Table 4 The sensitivity, specificity, PPV, and NPV of diagnostic tests

From: Predictive values of Alvarado score, serum C-reactive protein, and white blood cell count in the diagnosis of acute appendicitis: a prospective study

  AP WBC CRP AP + CRP AP + WBC CRP + WBC AP + CRP + WBC
Sensitivity 86.4 51.9 98.8 96.3 96.3 100.0 96.3
Specificity 63.2 89.5 36.8 42.1 26.3 26.3 47.4
PPV 90.9 95.5 86.9 87.6 84.8 85.3 88.6
NPV 52.2 30.4 87.5 72.7 62.5 100.0 75.0
LR+ 2.35 4.93 1.56 1.71 1.31 1.36 1.83
LR− 0.22 0.54 0.03 0.09 0.14 0.00 0.08