Wearable device derived electrocardiographic age and its association with atrial fibrillation.

Although the direction of effect was consistent in the external cohort (Memo Patch, n = 24 with AF episodes; average marginal effect 0.017, corresponding to a 1.7–percentage-point increase in AF burden per 1-year increase in the age gap), the association did not reach statistical significance because of the small sample size (95% CI –0.007 to 0.042; Figure S8a ).

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