. 2017 Apr;23(4):10.18553/jmcp.2017.23.4.446. doi: 10.18553/jmcp.2017.23.4.446

TABLE 4.

Validation Results of ROC Analysis (Area Under the Curve)

	Inpatient Costs	Outpatient Costs	ER Costs	DM Drug Costs	Other Costs	Total Costs
1-year cost equations
AUC (median as cutoff)	0.559^a	0.678^a	0.672^a	0.713^a	0.733^a	0.713^a
AUC (Q1 as cutoff)	0.559^a	0.692^a	0.672^a	0.755^a	0.761^a	0.741^a
AUC (Q3 as cutoff)	0.559^a	0.674^a	0.672^a	0.772^a	0.737^a	0.715^a
3-year cost equations
AUC (median as cutoff)	0.618^a	0.749^a	0.711^a	0.736^a	0.801^a	0.780^a
AUC (Q1 as cutoff)	0.618^a	0.791^a	0.711^a	0.774^a	0.850^a	0.8435^a
AUC (Q3 as cutoff)	0.627^a	0.728^a	0.721^a	0.812^a	0.782^a	0.744^a

Note: Median/Q1/Q3 of the actual cost were used as the cutoff to categorize high/low costs.

^aP < 0.0001 from ROC contrast test to compare the AUC of the model to chance (AUC of 0.5).

AUC = area under the curve; DM = diabetes mellitus; ER = emergency room; Q = quartile; ROC = receiver operating characteristic.