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Figure 2 Cost-effectiveness of prolonged clopidogrel therapy: sensitivity to variation in relative risk for myocardial infarction (MI). The cost per year of life saved is shown for values of relative risk for MI between 0 and 1. Solid line without symbols = all patients; line with triangles = high-risk patients; line with circles = low-risk patients. Baseline value of relative risk for MI is indicated by the vertical dotted line.