Statistical Analysis
All statistical tests were performed using SPSS version 23.0. Categorical variables are expressed as frequency with percentage, while continuous variables are expressed as mean and median with interquartile range (IQR). The chi‐square or Fisher’s exact test was used to compare the categorical variables. The Wilcoxon rank sum test was used to compare the continuous variables between different groups. Logistic regression analysis was performed to identify the independent risk factors of PR severity and re-stenosis while adjusting for potential confounding variables. The odds ratios (ORs) and 95% confidence intervals (CI) were obtained. Freedom from repeat PBPV or surgical intervention was evaluated using the Kaplan–Meier curve. Statistical significance was defined as a P value of <0.05.