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Scatterplot of cumulative predicted probability of atrial fibrillation at 5 years and age. The C-index for a Cox proportional hazards model using only age as a dependent variable was 0.684 (95% confidence interval: 0.674 to 0.694). While age is the most powerful predictor of incident atrial fibrillation, this figure demonstrates that for any given age there is a wide variability in the predicted probability of developing atrial fibrillation. AF: atrial fibrillation.
