Construction of the nomogram
intrahepatic bile
IHD, CHOLEDOCHOLITHIASIS
Combined with the above seven independent risk factors, a prediction model was constructed and presented in the form of a nomogram (Fig. Nomogram for predicting the risk of conversion to open surgery in laparoscopic surgery for choledocholithiasis. PUAS, previous upper abdominal surgery; CBD, common bile duct; LH, laparoscopic hepatectomy; IHD, intrahepatic bile ductThe AUCs for the prediction nomogram was 0.813 (95% CI: 0.766–0.861) in the training (Fig. Discrimination and validation of the nomogram. DCA curves for the nomogram in the training group. The x-axis represents the threshold probabilities and the y-axis measures the net benefit. The red line represents the nomogram. The dotted blue line represents that all patients underwent the conversion to laparotomy surgery. The dotted green line represents that all patients underwent laparoscopic surgery without conversion. The net benefit is calculated by adding the true positives and subtracting the false positives. DCA, decision curve analysis