Fig. 5

Model validation. A DCA in the external validation set. Light- and dark-grey lines represent the assumptions that all and no cases have a high risk, respectively. Red and blue curves showed that with a large probability range, utilizing the developed nomogram to predict the odds of SOM conferred a positive net benefit versus the radscore and the all-or-none scheme. The confusion matrix showed that using the nomogram model (C) would be more beneficial than applying the radscore alone (B)