Table 5.

Socioeconomic class and high service use: predictive accuracy of alternative morbidity models

Adults with Social Security Waiver (vs. all other adults)		Above average number of primary care visits	Above average number of specialist visits	Above average number of diagnostic tests	One or more hospitalizations
Model A: Adjusting for age and gender
Area under the ROC curve		0.74	0.66	0.66	0.67
AIC		315900	331209	262971	150883
Model B: Adjusting for age, gender and the Charlson Comorbidity Index
Area under the ROC curve		0.77	0.67	0.67	0.72
AIC		307183	329009	262267	142501
Model C: Adjusting for age, gender, and morbidity using ADG categories
Area under the ROC curve		0.85	0.77	0.72	0.86
AIC		254608	290254	247195	117215

ROC: Receiver Operating Characteristics

ADG: Aggregate Diagnostic Groups (dummy variables, non-mutually exclusive).

AIC: Akaike Information Criteria