Statistical analysis
REGRESSION
Data were input into Microsoft Excel 2019, and the SPSS Statistics 25.0 software program was used to conduct statistical analysis. Quantitative data were presented in the form of median and interquartile spacing, which did not conform to normal distribution; a rank-sum test was conducted for making comparisons between the groups. Qualitative data were expressed as the number of cases (percentage), and a rank-sum test was used for comparison between groups in this context. The influencing factors were analyzed by multi-factor linear regression analysis. Statistical significance was based on a 