Figure 2.

Variables included in final regression models for each comorbid condition. *Based on the enhanced ICD-9 coding of the Elixhauser comorbidity classification [29]. Hypertension combines hypertension, uncomplicated with complicated. Only used data from index encounter. ^†Versus not black. ^‡At least once during the index hospitalization. ^§Excluding topical steroids. || Documented in the social history. **Single includes single, widowed, divorced and separated. ^††Using ICD-9 procedure codes during index hospitalization.