Statistical Analysis
Continuous data were analyzed using the student’s t-test for normally distributed data and the Mann-Whitney test for non-normally distributed data. Categorical data were analyzed using the χ2 test. Values are presented as mean ± standard deviation or median and interquartile range (Q1-Q3) according to distribution for continuous data and count and percentage for categorical data unless otherwise stated. The cumulative probability of survival free from atrial arrhythmia was displayed according to the Kaplan–Meier method, with comparisons of cumulative event rates by the log-rank test. Follow-up for all patients was censored one year after ablation. A p-value of <0.05 was considered statistically significant. Analyses were performed using SPSS Statistics version 23.0 (IBM Corporation, Armonk, New York) and STATA Version 13 (Stata Corp, College Station, TX).