Figure 3. Estimated Rate of Restenosis.

Restenosis was defined by the first observation of stenosis of 70% or more of the diameter of the artery on duplex ultrasonography or by ipsilateral revascularization. Ultrasonography was performed at annual visits, and therefore a restenosis reported at year 1 was observed at the 1-year clinic visit (which was performed within a 30-day window). The inset shows the same data on an enlarged y axis.