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Figure 2 Mean (±SD) ejection fraction (upper left panel), standard deviation of N-N intervals (SDNN) measured from 24-h Holter recordings (upper right panel), QT dispersion (lower left panel), and QRS duration (lower right panel) measured by signal-averaged electrocardiogram (SAECG) among the survivors and those who experienced a non-sudden cardiac death (SCD) or SCD during follow-up. All variables differed significantly between survivors and those who had a non-SCD, although none of these variables differed between the survivors and those who experienced SCD.