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Cost per Year Life Gainedm = (Lifetime Cost of Rx / Years Added Life) / Percent Efficiency Liftime Cost of Rx = (Years of Therapy) x (Yearly Cost of Rx) * Percent effectiveness is a composite estimate of the percent of ideal effect achieved. It accounts for imperfect patient compliance, biological resistance to therapy, diminished benefits due to deaths of other causes of death, and any other factors that reduce the benefits of therapy.
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