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).