Annals of Pediatric Surgery

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

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