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

Table 5

Relation between duration of symptoms and accuracy of the New Scoring System (NSS).

Duration of symptoms	True negative	False positive	False negative	True positive
=<12 hours (n=402)	63.2%	10.2	2.5%	24.1%
12-24 hours (n=214)	49.1%	10.7	0.5%	39.7%
24-48 hours (n=184)	52.2%	2.7%	2.7%	42.4%
>48 hours (n=158)	50.6%	3.2%	1.9%	44.3%
Total	55.8%	7.7%	2.1%	34.4%