Notes: The y-axis measures the net benefit. The dotted line represents the tophi formation risk prediction nomogram. The thin solid line represents the assumption that all patients have tophi formed. Thin thick solid line represents the assumption that no patients have tophi formed. The decision curve showed that if the threshold probability of a patient and a doctor is 6.33% and 87.34%, respectively, using this nomogram in the current study to predict tophi formation risk adds more benefit than the intervention-all-patients scheme or the intervention-none scheme.