Statistical analysis
Data were presented as patient’s number (percentage) or odds ratio (OR) and 95% confidence interval (95% CI) where appropriate. All analyses were conducted using R software 3.6.2, with a neuralnet package for training and establishing the neural network predictive models and a pROC package to calculate the sensitivity, specificity, NPV, PPV, AUC, and accuracy. Confidence intervals were calculated based on the bootstrap method with 2000 replicates. A statistical significance was set at a level of 