Table 4.

Logistic regression validation results.

Model	R2a	LR (χ29)b	P value	Brier	Dxyc	C indexd	ge
Logistic model (30 days)	0.714	17.390	.004	0.069	0.541	0.770	1.348
Logistic model (120 days)	0.396	21.280	.002	0.114	0.706	0.853	2.051
Logistic model (365 days)	0.277	37.252	<.001	0.147	0.562	0.781	1.619

^aR² coefficient of determination.

^bLikelihood ratio chi-square test.

^cSomers Dxy test.

^dConcordance index.

^eGini index.