Fig. 2

a Calibration plot of nomogram. The dashed line indicates the ideal nomogram in which predicted and actual probabilities were perfectly identical. The dotted line indicates actual nomogram performance. The solid line presents the bootstrap corrected performance of our nomogram (B = 1000 repetitions). The calibration plot illustrates good predictive accuracy. b The receiver operating characteristic (ROC) curve of the multivariate logistic regression model. c Decision curve analysis (DCA) for the nomogram. The y-axis represents the net benefit. The x-axis shows the threshold probability. “All” refers to the assumption that all patients develop recurrent SBO after gastrectomy and “None” to the assumption that no patient develops recurrent SBO