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Briesacher and colleagues highlight that we identified a greater reduction in mean out-of-pocket expenditures (32%) among Medicare beneficiaries participating in the MEPS1 than previous studies (range, 13%-18%).2,3 They suggest that this may be partly owing to the longitudinal study design used, which limits the generalizability of our findings to the elderly Medicare population.
Millett C, Everett CJ, Matheson EM, Bindman AB, Mainous AG. Caution in Generalizing Part D Results to Medicare Population—Reply. Arch Intern Med. 2011;171(4):365-369. doi:10.1001/archinternmed.2011.10