Figure 2. Atrial Fibrillation Burden Before and After Ablation, Stratified by Longest Atrial Fibrillation Episode Duration Recorded on Preablation Monitoring.

Atrial fibrillation burden defined as percentage of time in atrial fibrillation. The center line indicates the median; the bottom and the top of the box, the 25th and 75th percentiles, respectively, and the lower and upper whiskers, the 10th and 90th percentiles, respectively.