Statistical analysis
NRI
REGRESSION
The median (IQR), frequency (proportions), Mann–Whitney U tests, independent t-tests, Pearson’s chi-square test, Fisher’s exact test, and univariate and multivariate binary logistic regression analysis were calculated by SPSS (SPSS Inc., Chicago, USA). Nomograms, ROC curves, calibration plots, the nutrition risk index (NRI), integrated discrimination improvement (IDI), DCA curves, and Kaplan–Meier plots, were conducted by R software (version 4.2.2). 