Statistical analysis
The Shapiro-Wilk test was used to test the normality of distribution of variables. For uniformity, all continuous variables are presented as the mean ± standard deviation. The categorical variables are presented as number and percentage.
The significance of difference between groups were analyzed using the unpaired “U” Mann-Whitney test for continuous variables and the Chi2 test with Yates correction for categorical variables. The results of analysis were considered statistically significant at a p value < 0.05. Univariate and multivariate logistic regression analysis was used to assess the impact of echocardiographic findings on TLE complexity and efficacy. Variables that in univariate analysis achieved statistical significance p<0.05 were entered into the multivariate model. Statistical analysis was performed with Statistica version 13.0 (TIBCO Software Inc., Krakow, Poland)