Published Online: October 08, 2009
Sherrie L. Aspinall, PharmD, MSc; Jessica S. Banthin, PhD; Chester B. Good, MD, MPH; G. Edward Miller, PhD; and Francesca E. Cunningham, PharmD
Objective: To compare users and nonusers of Veterans Affairs (VA) pharmacy services by age group.
Study Design: Cross-sectional.
Methods: We used data on sociodemographics, health status, and medical conditions from the Medical Expenditure Panel Survey (MEPS) to compare users and nonusers of VA pharmacies for medications. Data were pooled for 2003-2005 to ensure adequate sample sizes. Student t tests were used to compare the means for each variable, and all analyses were adjusted for the complex sample design of the MEPS.
Results: Among both nonelderly (18-64 years) and elderly (≥65 years) veterans, a higher proportion who used VA pharmacy services versus those who did not use VA pharmacy services (1) were black (nonelderly: 17.7 % vs 7.4%, P <.001; elderly: 9.4% vs 4.7%, P <.001); (2) had no alternative insurance (nonelderly: 27.2% vs 4.8%, P <.001; elderly: 36.3% vs 19.9%, P <.001); (3) had lower incomes (nonelderly: 32.4% vs 11.5%, P <.001; elderly: 32.4% vs 25.4%, P = .01); (4) had less than a high school education (nonelderly: 13.0% vs 6.5%, P <.001; elderly: 27.5% vs 17.6%, P <.001); (5) were disabled; and (6) reported poorer health. A higher percentage of nonelderly users reported a mental health condition (31.6% vs 19.4%, P <.001).
Conclusions: Veterans who use VA pharmacy services appear to be more ill than those who do not use VA pharmacy services. In addition, the VA appears to be a safety net for uninsured veterans who have mental health problems.
(Am J Manag Care. 2009;15(10):701-708)
Knowledge about the users of Veterans Affairs (VA) pharmacy services is valuable when comparing the VA national drug plan with other models of prescription drug coverage because patient characteristics influence the types of medications included in the plans, as well as their level of use.
- Veterans who use VA pharmacy services appear to be more ill than their counterparts who do not use the VA pharmacy benefit.
- Mental health problems are especially prevalent among nonelderly users, and services for these illnesses may need to be expanded in the future.
The Department of Veterans Affairs (VA) provides a comprehensive prescription drug program designed to address the medication needs of veterans, while maintaining low costs.1,2 Most veterans pay $8 for a 30-day supply of each medication they receive, with an annual maximum out-of-pocket expense of $960. However, veterans do not pay for medications associated with a condition that is connected to their military service, and veterans whose incomes are below a certain threshold pay nothing at all. An ongoing challenge for the VA is to provide high levels of service within a fixed budget, rising drug costs, and increasing use of prescription medications. The VA established a pharmacy benefits management (PBM) group in 1995 to manage the drug formulary for the entire VA system,1 which served over 4.4 million veterans in fiscal year 2007 and provided more than 122 million prescriptions. When updating the formulary, staff from the VA PBM consider the available evidence on the efficacy and safety of the drugs, their relevance to the VA population, and their place in therapy relative to currently available medications, as well as cost.2 Previous studies comparing the characteristics of veterans who use VA medical centers for healthcare services with the characteristics of veterans who obtain their care elsewhere have found that, in general, veterans who use the VA have lower incomes and education levels and report poorer health.3,4 In addition, among veterans younger than age 65 years, those who were uninsured were more likely to use the VA for healthcare.3,5 However, these studies did not specifically address the use of VA pharmacy services, and they did not evaluate differences while controlling for age, aside from insurance status.
As prescription drug use and expenditures have risen dramatically over time,6 it is important to focus on veterans who may come to the VA primarily to take advantage of the pharmacy benefit.5 In addition, knowledge about the users of VA pharmacy services is valuable when comparing the VA national drug plan with other models of prescription drug coverage, such as Medicare Part D, because patient characteristics have an effect on the types of medications included in the plans and the level of use of those medications. The VA serves a disproportionately elderly population who are more likely than younger veterans to be heavy users of prescription medications; therefore, it is necessary to adjust for age when comparing VA users with nonusers. In addition, comparing differences in pharmacy use by age could provide insight into futureutilization when, for example, increasing numbers of younger veterans may turn to the VA for healthcare and pharmacy benefits on their return from the wars in Iraq and Afghanistan.
Source of Data
We used data from the Medical Expenditure Panel Survey (MEPS) to compare veterans who were users of VA pharmacy services with those who were nonusers; comparisons were made separately by age group. MEPS data are especially useful for describing these populations because the survey ascertains veteran status and includes detailed information on sociodemographic variables, health status, and medical conditions. The MEPS also measures all healthcare service utilization inside and outside of the VA.
The MEPS, sponsored by the Agency for Healthcare Research and Quality, is an ongoing survey that collects nationally representative data on healthcare utilization, expenditures, sources of payment, insurance coverage, and health status for the civilian, noninstitutionalized population. Additional demographic and socioeconomic data are collected for all individuals in sampled households through computer-assisted personal interviews. Each year approximately 13,000 households and 35,000 individuals are surveyed. The MEPS verifies household reports of payments for medical care services through provider follow-back surveys. To verify the sources of payment for prescribed medicines, respondents are asked for permission to contact their pharmacy, including VA pharmacies. For this analysis, we pooled data from the MEPS for 2003 through 2005 to ensure adequate sample sizes for comparing VA pharmacy users with nonusers by age group. The larger samples reduced the standard errors surrounding the estimates, and smaller standard errors thus allowed us to discuss more statistically significant differences between the groups. At the time, 2005 was the most recent year with complete data.
We defined a treatment group consisting of users of VA pharmacy services. “Users” included veterans who had at least 1 VA pharmacy claim and used the VA for at least 1 inpatient, outpatient, office-based, home health, or dental service. Similarly, we defined a control group of veterans who did not use the VA pharmacy. These “nonusers” consisted of veterans who had at least 1 non-VA pharmacy claim and used at least 1 healthcare service from the list above from a non-VA provider. The treatment and control groups were defined in this manner because it increased the accuracy of the sources of payment for the claims. The MEPS data showed that about 3.3% of veterans had a pharmacy claim, but no other reported use of health services. This may have occurred, in some cases, because an office visit or other physician contact took place prior to data collection. By definition, these individuals were excluded from our analysis.
We defined veterans between the ages of 18 and 64 years as nonelderly and those over the age of 65 years as elderly. For veterans who used VA pharmacy services, the sample sizes were 533 and 638 for the nonelderly and elderly groups, respectively. The sample sizes for veterans who did not use VA pharmacy services were 1555 and 1428 for the nonelderly and elderly groups, respectively. Our results were weighted to be nationally representative of the US civilian, noninstitutionalized population of these age groups.7
Student t tests were used to compare the means for each variable in the 2 groups of veterans. All analyses were adjusted for the complex sample design of the MEPS using SUDAAN version 9.0.1 (Research Triangle Institute, Research Triangle Park, NC).
Using our definition of the treatment group, we found that about 4.2 million veterans used the VA pharmacy on average each year in 2003 through 2005. This estimate matched closely the VA administrative data. This treatment group included 1.8 million veterans younger than age 65 years and 2.4 million veterans age ≥65 years. Our control group of veterans who did not use the VA pharmacy included an average annual total of 11.6 million veterans, of whom 6.1 million were under age 65 years and 5.5 million were age >65 years. Table 1 displays the sociodemographic characteristics of nonelderly users versus nonusers of VA pharmacy services. Table 2 presents the same data for elderly veterans.
There were many differences between users and nonusers of VA pharmacy services in the nonelderly veteran population. Users of VA pharmacy services were more likely than nonusers to be black (17.7% vs 7.4%, P <.001), less likely to be married (53.6% vs 76.0%, P <.001), and twice as likely to have less than a high school education (13.0% vs 6.5%, P <.001). In addition, users were much more likely than nonusers to be unemployed or out of the labor force (47.7% vs 19.8%, P <.001) and living in a poor or low-income family (32.4% vs 11.5%, P <.001). Fewer users than nonusers lived in high-income families (40.6% vs 60.0%, P <.001).
Nonelderly users also differed significantly from nonusers in terms of insurance status. More than one-quarter of nonelderly VA pharmacy users were uninsured compared with less than 5% of nonusers (27.2% vs 4.8%, P <.001). In addition, a much larger proportion of users had public coverage compared with nonusers (16.9% vs 3.8%, P <.001). As a result, while 91.4% of nonusers were covered by private insurance, the same was true for only 55.8% of users.
There were fewer differences between elderly users and nonusers of VA pharmacy services. As with the younger age group, elderly users were more likely to be black (9.4% vs 4.7%, P <.001) and have less than a high school education (27.5% vs 17.6%, P <.001) compared with elderly nonusers. But there were no differences in marital or employment status. Income differences were similar but less pronounced, with more users living in poor or low-income families (32.4% vs 25.4%, P = .01) and fewer users living in high-income families (33.3% vs 43.9%, P <.001). In the elderly age group, 57.5% ofveterans who used VA pharmacy services had private insurance (in addition to Medicare) versus 76.0% of nonusers (P <.001), and 36.3% of users had Medicare only versus 19.9% of nonusers (P <.001).
Health Status and Medical Conditions
Table 3 and Table 4 present the health status and medical conditions of users versus nonusers of VA pharmacy services in nonelderly and elderly veterans, respectively. Regardless of the age category, veterans who used VA pharmacy services reported poorer health status along many dimensions compared with veterans who did not use the VA pharmacy.
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