Fig. 5

ROC curves of different echo signs. The AUC of echo sign 1 was the highest, followed by echo signs 2 and 3. The AUC was significantly increased for the combination of echo signs 1 and 2. When echo signs 1, 2, and 3 were combined, the AUC decreased but was higher than echo sign 1. Echo sign 1, Increased supra-aortic valve velocity; echo sign 2, Two commissures and a “fish-mouth” opening; echo sign 3, Thickening, hyperechogenicity, or the presence of a raphe; echo sign 4, Post-stenotic widening of the ascending aorta; echo sign 5, Restricted motion or opening; echo sign 6, Eccentric or a-linear closure line