Table 4.

Calculation of independent discrimination for IRIC, ACRI, NNIS risk index, and EuroSCORE-1 (training sample).

Scores	aROC	SE	p	95% CI
ACRI	0.67	0.043	<0.001	0.59–0.74
NNIS Risk Index	0.59	0.038	0.024	0.52–0.67
EuroSCORE-1	0.58	0.039	0.045	0.50–0.67
IRIC	0.70	0.039	<0.001	0.63–0.78

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