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Brief Reports   |    
National Trends in the Use of Antidepressants Between 1997 and 2009 and the Role of Medicare Part D Implementation
Dooyoung Lim, M.H.A.; Kyoungrae Jung, Ph.D.; Yunfeng Shi, Ph.D.
Psychiatric Services 2013; doi: 10.1176/appi.ps.201200438
View Author and Article Information

The authors are affiliated with the Department of Health Policy and Administration, College of Health and Human Development, Pennsylvania State University, University Park, Pennsylvania. Send correspondence to Dr. Jung at the department, 604 Ford Building, University Park, PA 16802 (e-mail: kuj11@psu.edu).

Copyright © 2013 by the American Psychiatric Association


Objectives  This study examined national trends in antidepressant use before and after implementation of Medicare Part D and compared utilization among individuals with different types of insurance.

Methods  The data source was the Medical Expenditure Panel Survey Household Component (1997–2009), and logistic regression was used for the analysis.

Results  The odds of antidepressant use among people with depression increased between 1997 and 2009 in each insurance group (Medicare: adjusted odds ratio [AOR]=3.30, 95% confidence interval [CI]=1.84–5.92; Medicaid: AOR=2.97, CI=2.01–4.40; dually eligible for Medicare and Medicaid: AOR=2.24, CI=1.11–4.54; and private coverage: AOR=6.63, CI=5.23–8.42). The odds of antidepressant use after implementation of Part D increased more among Medicare beneficiaries than among Medicaid beneficiaries (AOR=1.35, CI=1.05–1.72).

Conclusions  The use of antidepressants among people with depression increased in all insurance groups up to 2009; however, the patterns of utilization and the degree of increase over time differed by insurance type.

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Table 1Odds of antidepressant use over time among persons with depression, by type of insurance
Table Footer Note

a Federal poverty level

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Table 2Odds of antidepressant treatment after implementation of Medicare Part D among Medicare beneficiaries versus beneficiaries with other insurancea
Table Footer Note

a All regression models include year dummies and respondents’ health and sociodemographic factors.

Table Footer Note

b Part D indicator represents years 2006 and later.



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