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Figure 4 Cost-effectiveness of prolonged clopidogrel therapy: sensitivity to variation in estimate of the reduction in life expectancy associated with myocardial infarction (MI). The cost per year of life saved is shown for a range of values of reduction in life expectancy subsequent to MI. Solid line without symbols = all patients; line with triangles = high-risk patients; line with circles = low-risk patients. Baseline value for reduction in life expectancy due to MI is indicated by the vertical dotted line.