Statistical analysis
REGRESSION
Continuous variables are presented as the mean ± standard deviation (SD) for normal distribution and as the median and interquartile range (IQR) for skewed distribution. Normal distributions were confirmed by Agostino tests. Continuous variables were compared by unpaired Student’s test or Mann–Whitney Univariate logistic regression analysis was performed to explore the potential factors with The data of 7413 patients were randomly assigned into two complementary subsets: the training set of 5194 patients (70%) was used to establish the model and the validation set of 2219 patients (30%) was used to validate the analysis. The Harrell’s concordance index (All analyses were conducted using R software (version 3.6.3) and two-sided 