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Figure 3 (A) Receiver operating characteristic (ROC) curve analysis revealed that 13.5 years of age at the index surgical repair of coarctation was a threshold for increased risk of postsurgical aneurysmal formation. The area under the ROC curve was 0.76 (95% confidence interval 0.67 to 0.85; p < 0.0005). (B) For better identification of the cut-off age separating high and low risk, data are displayed separately for sensitivity (squares) and specificity (triangles).
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