Background: Quality initiatives such as the Medicare Part D Star Ratings program rely on medication adherence measurements. Prior research characterized the longitudinal patterns of adherence to medications for chronic conditions such as hypertension, dyslipidemia, and diabetes. However, the association between longitudinal trajectories of medication adherence and disease-specific clinical outcomes has not been explored, hindering the evaluation of incentive programs like the Medicare Part D Star Ratings.
Objective: To examine the association between longitudinal trajectories of adherence to medication for hypertension, dyslipidemia, and diabetes and clinical outcomes, including myocardial infarction (MI), stroke, and diabetes-specific clinical outcomes (diabetic neuropathy, nephropathy, peripheral angiopathy, and ophthalmic complications).
Methods: Administrative claims data linked to the Health and Retirement Study between 2008 and 2016 (N = 11,068) were used to calculate the monthly proportion of days covered and estimate longitudinal medication adherence trajectories of antihypertensives, statins, and oral diabetes medications. Clinical events were identified by the first respective medical diagnosis codes. The association between longitudinal medication adherence trajectories and clinical outcomes was examined by logistic regression models.
Results: Trajectory groups showing suboptimal adherence for patients taking hypertension or statin medications were found to exhibit higher risk for MI and stroke than high or very high adherence trajectories. For diabetes medications, declining adherence trajectories were found to have higher risk for MI, nephropathy, and peripheral angiopathy complications but not stroke, neuropathy, or ophthalmic complications. This study showed an inconsistent association between trajectory groups exhibiting suboptimal adherence and adverse clinical outcomes across different chronic medications. Trajectory groups with steeper declines in adherence were generally associated with worse outcomes.
Conclusions: The results described the nuanced association between levels of adherence and risk of experiencing certain disease-specific clinical outcomes. Although improving medication adherence is a valuable method to achieve optimal outcomes, quality metrics based on medication adherence could be adjusted to help providers further personalize care and structure value-based care programs tied to pharmacy interventions aimed at improving medication adherence.
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