Table 5.

DeLong test comparisons of the 7-variable risk model with conventional severity scores for predicting 28-day ICU mortality.

Cohort	Comparison	Model AUC	Score AUC	Difference	P value
Training	Model vs SOFA	0.674	0.632	0.042	0.014
Training	Model vs APS III	0.674	0.668	0.006	0.727
Training	Model vs SAPS II	0.674	0.673	0.001	0.961
Training	Model vs OASIS	0.674	0.594	0.080	<0.001
Training	Model vs Charlson	0.674	0.576	0.098	<0.001
Training	Model vs APACHE II	0.674	0.635	0.039	0.034
Validation	Model vs SOFA	0.677	0.642	0.035	0.208
Validation	Model vs APS III	0.677	0.650	0.027	0.319
Validation	Model vs SAPS II	0.677	0.665	0.012	0.709
Validation	Model vs OASIS	0.677	0.641	0.037	0.309
Validation	Model vs Charlson	0.677	0.636	0.042	0.230
Validation	Model vs APACHE II	0.677	0.615	0.062	0.041
External	Model vs SOFA	0.783	0.687	0.096	0.012
External	Model vs APS III	0.783	0.680	0.103	0.018
External	Model vs SAPS II	0.783	0.682	0.101	0.032
External	Model vs OASIS	0.783	0.763	0.020	0.676
External	Model vs Charlson	0.783	0.629	0.154	0.006
External	Model vs APACHE II	0.783	0.647	0.135	0.001

AUC , area under the receiver operating characteristic curve. P value from DeLong test for pairwise AUC comparison. Bold P values indicate statistical significance (P < 0.05).