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Figure 6 Receiver-operating characteristic (ROC) curves for comparison of diastolic velocity (DV), diastolic/systolic velocity (DVSV) ratio, and peak systolic pressure gradient (SPG) as indexes of coarctation severity. CI = confidence interval. Area under ROC curve for diastolic velocity (DV) = 1.000 (SE = 0.000, 95% CI = 0.904 to 1.00); area under ROC curve for diastolic/systolic velocity ratio (DV/SV ratio) = 0.997 (SE = 0.011, 95% CI = 0.898 to 1.000); area under ROC curve for peak systolic pressure gradient (SPG) = 0.994 (SE 0.016, 95% CI 0.892 to 1.000).