Age ≥65 Years Age <65 Years Breslow-Day p   n/N OR (95%CI) n/N OR (95%CI)   30-Day Readmission       Hispanic versus White/Asian 14/44 7/126 7.9 (2.9-21.4) Jun-57 Sep-97 1.2 (0.4-3.4) 0.008 Hispanic versus Black 14/44 0/34 31.7 (1.8-555.9)* Jun-57 May-49 1.0 (0.3-3.6) 0.004 Black versus White/Asian 0/34 7/126 0.3 (0.01-4.5)* May-49 Sep-97 1.1 (0.4-3.5) 0.16 1-Year Mortality         Hispanic versus White/Asian Jun-44 45/126 0.3 (0.1-0.7) Oct-57 15/97 1.2 (0.5-2.8) 0.03 Hispanic versus Black Jun-44 Sep-34 0.4 (0.1-1.3) Oct-57 Sep-49 0.9 (0.3-2.6) 0.32 Black versus White/Asian Sep-34 45/126 0.6 (0.3-1.5) Sep-49 15/97 1.2 (0.5-3.1) 0.31

Table 3: Age-stratified analysis of the associations between race/ethnic group, 30-day readmission and 1-year mortality. *OR estimated by imputing value of 0.5 to replace zero count for number of blacks ≥65 years readmitted at 30-days.