Statistical Analysis
Continuous variables were described with measures of central tendency and dispersion (mean and standard deviation). Categorical variables were described as frequencies. Continuous variables were evaluated byt -test, and categorical variables were compared withχ 2 or Fisher’s exact test. 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. Multivariable Cox proportional hazards regression analysis was used to assess the impact of variables of interest on the recurrence of atrial arrhythmia, adjusting for relevant covariates known to influence the recurrence rate. Follow-up for all patients was censored at one year after ablation. A p-value of < 0.05 was considered statistically significant. All analyses were performed using SPSS Statistics Software for Windows version 23.0 (IBM Corporation, Armonk, New York).