Hazard Ratio with 95% confidence intervals are shown for subgroups 4a. treatment group (bucindolol and placebo), 4b. race (African-American, AA and Non-African-American, Non-AA), and 4c. sex.1 indicates Cox model test for significance of treatment × LVEF response indicator interaction;2, Cox model test for significance of race × LVEF response indicator interaction;3, Cox model test for significance of sex × LVEF response indicator interaction; ACM, all-cause mortality; CVM, cardiovascular mortality; and HFH, heart failure hospitalization.