The Effect of the Medicare Part D Prescription Benefit on Drug Utilization and Expenditures

Figure 2.
Figure 2. Trends in prescription drug utilization.

Top. Monthly pill-days of drug utilization. Bottom. Trend in factual utilization versus counterfactual utilization associated with no implementation of Part D. GEE = generalized estimating equation.

This Article

  1. Published online before print January 7, 2008, Ann Intern Med February 5, 2008 vol. 148 no. 3 169-177
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