Figure 1.

Hazard ratio for detection of any AF and for first AF episode ≥24 h. The figure shows the relative risk of AF detection (A) and AF episode ≥24 h (B) according to dichotomized ECG parameters. Interatrial block was defined as P-wave duration ≥120 ms combined with biphasic (positive–negative) P-wave in any inferior lead. QTc interval was estimated using the Framingham formula. Hazard ratios were determined in multivariate Cox models with death as competing risk. Abbreviations: AF, atrial fibrillation; CI, confidence interval; ECG, electrocardiogram; QTc, heart rate-corrected QT interval.