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.