Statistical analysis
To compare between groups, either chi-square tests or non-parametric U tests were employed. Frequency distribution (%), obtained through the chi-square test, was used to describe the remaining variable types. The survival disparities between the groups were examined using the Log-rank test and K-M curves. The statistical analysis was conducted using R software (version 3.6.2). R packages utilized in this study included “rms,” “survival,” “survminer,” and “ggDCA.” All statistical significance in this study was determined using a 