Statistical Analysis
Continuous variables were expressed as mean ± standard deviation or as
median interquartile range (IQR), as appropriate and categorical
variables were expressed as n (%). Continuous variables were tested for
normality of distribution with a Shapiro–Wilk test and comparisons
between BAV and TAV patients were done with two-tailed Student’s t test
or a Fisher’s exact test, as appropriate.
Univariate analysis of all parameters obtained during patient
recruitment was carried out to predict the primary and secondary
endpoints. Then a multivariate analysis was performed and the criteria
for introducing variables were their clinical relevance and statistical
significance in the univariate analysis. Survival was computed using the
Kaplan–Meier method and was compared between groups using the
two-sample logrank test.
Statistical analysis was performed with STATA. A P-value <0.05
was considered significant.