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Quintiles of predicted probability and observed outcomes in the non-ICD medical therapy arms of the SCD-HeFT external validation cohort at 1, 2 and 5 years of follow up. Patients were divided into quintile of predicted risk of transition 2 . Quintile 1 (Q1) refers to the lowest risk quartile and quintile 5 (Q5) refers to the highest risk quartile. HFH refers to heart failure hospitalization.
