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Predictors of Pharmacy-Based Measurement and Self-Report of Antidepressant Adherence: Are Individuals Overestimating Adherence?

Leggett A, Ganoczy D, Zivin K, Valenstein M. Predictors of Pharmacy-Based Measurement and Self-Report of Antidepressant Adherence: Are Individuals Overestimating Adherence? Psychiatric services (Washington, D.C.). 2016 Jul 1; 67(7):803-6.

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Abstract:

OBJECTIVE: This study considered various factors as predictors of antidepressant adherence over time as assessed by self-report and medication possession ratios (MPRs) derived from administrative pharmacy data. METHODS: Adherence was assessed at six and 12 months among 443 veterans in ongoing treatment for depression in a trial of peer support. Logistic regression models were utilized to consider predictors of adequate adherence. RESULTS: At six and 12 months, respectively, 36% and 35% of patients had poor adherence on the basis of MPRs and 24% and 18% had poor adherence on the basis of self-report. MPRs indicating poor adherence were more likely among men, members of racial groups other than white, and patients with Hispanic ethnicity. Poor self-reported adherence was associated with increased depressive symptoms and unemployment. CONCLUSIONS: These adherence measures may be complementary. Strategies to improve adherence might target specific demographic groups, unemployed persons, and persons with higher levels of depressive symptoms.





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