https://www.selleckchem.com/pr....oducts/kaempferide.h
OBJECTIVE To evaluate the impact of 3-tier (copayment) pharmacy benefit structures on medication utilization behavior. METHODS A pretest-posttest quasi-experimental design was employed. Chronic disease sufferers (N=8,132) from a health plan were classified into the following groups (a) 2-tier copayment moving to a 3-tier structure, ("converting" group), (b) 2-tier staying in a 2-tier structure and, (c) 3-tier staying in a 3-tier structure. The latter 2 were "comparison" groups. Two 7-month time periods were determined the "preperiod
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