Statistical Analysis
Data processing and statistical analyses were performed using MATLAB (Statistics Toolbox, The Mathworks, Natick, MA). Total population-wise EGM and TP day volumes were expressed by count, while patient-wise EGM volumes were expressed as count per patient per month using median and interquartile range [25th percentile, 75th percentile]. Differences in EGM volumes per patient per month between all vs. key EGMs were tested using the Wilcoxon signed-rank test. Differences in freedom from arrhythmia diagnosis between reviewing all vs. key EGMs were displayed using Kaplan-Meier estimator curves and tested using the log-rank test. P < 0.05 was considered statistically significant.