Statistical Analysis
Continuous data are presented as median and IQR, the categorical variables as values and percentages. Comparisons between groups were performed with the Mann–Whitney U-test, or the chi2 test, as appropriate. Multivariate stepwise forward logistic regression analyses was performed to isolate factors associated with the existence of LVA. Only variables with significant p-values on univariate analysis were included in the multivariate model. The correlation between variables was assessed using a Spearman rank test. Statistical significance was accepted at p value < 0.05. The analysis was performed using Statistica software version 13.3 (StatSoft).