Statistical analysis
Continuous data are expressed as mean ± standard deviation or median (interquartile range). Categorical data are presented as absolute values and percentages. Tests for significance were conducted using the unpaired t -test for continuous variables, and the chi-squared test or Fisher’s exact test for categorical variables. To predict sufficient ablation lesion formation, receiver-operating characteristic curves were constructed for different impedance parameter cut-off values. The area under each curve and 95% confidence interval were determined using the bootstrap method. Pearson’s correlation coefficient analysis was performed to assess correlations between continuous variables. All analyses were performed using SPSS version 22.0 software (SPSS, Inc., Chicago IL, USA).