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J Pharm Health Serv Res. 2013 Jun;4(2):89-94.

Factors Affecting Sustained Medication Adherence and Its Impact on Health Care Utilization in Patients with Diabetes.

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1
University of Hawaii at Hilo, College of Pharmacy.

Abstract

OBJECTIVE:

To identify factors associated with years of medication adherence and to examine the relationship between years of adherence and health care utilization.

METHODS:

This retrospective analysis used administrative data from adult patients with diabetes enrolled in health plan in Hawaii for four years (n= 23,450 patients). Ordered logistic regression was used to examine factors related to years of medication adherence for three types of medications (anti-diabetic, antihypertensive, lipid-lowering). Multivariable logistic regression and negative binomial regression were used to examine relationship between years of adherence and health care utilization (hospitalizations and emergency department visits).

KEY FINDINGS:

Adherence to any of the medications for all four years was significantly associated with lower odds of a hospitalization or emergency department visit in the third year. The magnitude of reduction in utilization was greater for adherence to anti-diabetic and lipid-lowering medications, at 31% compared to 22% for antihypertensives. The 9% of patients who were adherent to all three types of medications for all four years showed a reduction of 53%.

CONCLUSIONS:

Improvement is needed in medication adherence across all three types of medication. Interventions may need to target younger adults, women, patients with congestive heart failure, Filipinos and Native Hawaiians.

KEYWORDS:

Medication adherence; health care utilization; health disparities

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