Retrospective Multivariate Analysis of Data from Children with Suspected Appendicitis: A New Tool for Diagnosis

Table 4

Diagnostic performance of ASS, PAS, and NSS (PPV: positive predictive value, NPV: negative predictive value, ASS: Alvarado Scoring System, PAS: Pediatric Appendicitis Score, and NSS: New Scoring System).

		ASS; (Cut-off: 7)	PAS; (Cut-off: 8)	NSS; (Cut-off: 12)
# of patients	True positive	271 (28.3%)	192 (20%)	336 (35.1%)
	False positive	188 (19.6%)	46 (4.8%)	101 (10.5%)
	False negative	77 (8%)	156 (16.3%)	12 (1.3%)
	True negative	422 (44.1%)	564 (58.9%)	509 (53.1%)
Sensitivity ()		77.8	55.2	94.6
Specificity ()		70	92.5	87.9
PPV ()		59.1	80.8	81.6
NPV ()		84.5	78.3	96.6
Kappa coefficient		0.441	0.512	0.797