Statistical Analysis
Descriptive statistics were summarized by presenting the number and percentage for categorical variables, whereas the mean and standard deviation (±SD) were calculated for continuous ones. The comparison between the CSVT outcome and categorical variables was assessed by Pearson chi-square test, whereas the Student’s t-test was used for the continuous variables. Moreover, we carried out multivariate stepwise logistic regression to identify the predictors of CSVT. Results are presented as odds ratios (OR) and 95% confidence intervals (CI). We used a P-value less than 0.05 to indicate statistical significance. We used IBM SPSS statistical software for Windows version 22 (SPSS for Windows, version 22; SPSS, Inc., Chicago, IL).