Objective
The current study considers demographic, social, psychological, and clinical factors as predictors of adherence over time using both the Brief Medication Questionnaire (BMQ) based on self-report and medication possession ratios (MPRs) based on administrative pharmacy-data.
Methods
Adherence was assessed at 6 and 12 months among 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 6 and 12 months, 36% and 35% of patients had poor adherence based on MPRs while 24% and 18% had poor adherence based on self-report. Poor adherence based on MPRs was more likely among men, non-whites, and those of Hispanic ethnicity. Poor self-reported adherence was more likely with increased depressive symptoms and unemployment.
Conclusions
These adherence measures may be complementary. Strategies to improve adherence might target specific demographic groups and those experiencing unemployment and higher levels of depressive symptoms.