Table 6. Comparison of the novel scores with the existing ones.

	Concordance (95% CI)	AIC
Four-level scores
ABE4	0.686 (0.637, 0.735)	1304
IPI	0.635 (0.584, 0.686)	1336
Age-adjusted IPI	0.650 (0.599, 0.701)	1325
Elderly IPI	0.665 (0.614, 0.716)	1292
Three-level scores
ABE3	0.676 (0.631, 0.721)	1299
RIPI	0.605 (0.558, 0.652)	1340
ALC/RIPI	0.619 (0.570, 0.668)	1337

Results from comparison of newly constructed scores (ABE4-Score and ABE3-Score) with several existing scoring systems. The measure of concordance compares the model discrimination, the Akaike Information Criterion (AIC) compares the model fit.