Mild nondiagnostic criteria included isolated left or right ventricular dilation on transthoracic echocardiogram or cardiac magnetic resonance imaging, atrial fibrillation, nonsustained ventricular tachycardia, frequent ventricular ectopy, late gadolinium enhancement on cardiac magnetic resonance imaging, and T-wave inversion on electrocardiogram with LVEF 50% or higher. IQR indicates interquartile range.