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Figure 8 Mean and standard deviations of QT dispersion in patients with (closed circles) and without (open circles) serious ventricular arrhythmias. In one study patients with ventricular fibrillation (closed diamond) and sustained monomorphic ventricular tachycardias (closed circle) were compared separately with patients without sustained ventricular arrhythmias. *p < 0.05 between groups with and without serious ventricular arrhythmias; NS: statistically nonsignificant difference between groups with and without serious ventricular arrhythmias.