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Fig. 16A. —Example of Kaplan-Meier survival graphs. (Reprinted with permission from [14]) Graphs illustrate proportion of individuals who remain without stroke divided by degree of stenosis of less than 50% (A) and greater than 50% (B). Each group is further divided by nonhypoechoic and hypoechoic findings. Although patients with nonhypoechoic findings in B have higher occurrence of strokes than those of both groups in A, difference in y-axis range in B makes proportions appear nearly identical.

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