Table 5.

Calculation of discrimination for the compared scoring systems (test sample).

Scores	aROC	SE	p	95% CI
ACRI	0.61	0.057	0.047	0.50–0.72
NNIS Risk Index	0.61	0.052	0.054	0.50–0.71
IRIC	0.66	0.054	0.004	0.55–0.76

ACRI, Australian Clinical Risk Index; aROC, area under the Receiver-Operating Characteristic curve; CI, confidence interval; IRIC, Infection Risk Index in Cardiac surgery; NNIS, National Nosocomial Infections Surveillance; SE, standard error.