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Figure 2 Cumulative probability of first appropriate defibrillator therapy for ventricular tachycardia or fibrillation in patients with QT variability (QTVN) by quartile of QTVN. P value from log-rank statistics. ICD = implantable cardioverter defibrillator; VF = ventricular fibrillation; VT = ventricular tachycardia.
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