Fig. 4

ROC curves for predicting a mid/high SYNTAX score. The area under the ROC curve of the TyG index, FBS, and TG for predicting a mid/high SYNTAX score (> 22) was 0.631 (95% CI 0.588–0.674, P < 0.001), 0.574 (95% CI 0.528–0.621, P = 0.002), and 0.613 (95% CI 0.567–0.659, P < 0.001), respectively. SYNTAX score Synergy Between Percutaneous Coronary Intervention score, TyG index triglyceride–glucose index, ROC curve receiver operating characteristic curve, FBG fasting blood glucose, TG triglyceride