Effectiveness and cost of specific treatment elements in a program for homeless mentally ill veterans

Interventions to improve the mental health of women experiencing homelessness: A systematic review of the literature

BACKGROUND

Homelessness is a growing public health challenge in the United Kingdom and internationally, with major consequences for physical and mental health. Women represent a particularly vulnerable subgroup of the homeless population, with some evidence suggesting that they suffer worse mental health outcomes than their male counterparts. Interventions aimed at improving the lives of homeless women have the potential to enhance mental health and reduce the burden of mental illness in this population. This review synthesised the evidence on the effectiveness and acceptability of interventions which aim to improve mental health outcomes in homeless women.

METHODS

Five electronic bibliographic databases: MEDLINE, PsycInfo, CINAHL, ASSIA and EMBASE, were searched. Studies were included if they measured the effectiveness or acceptability of any intervention in improving mental health outcomes in homeless women. Study quality was assessed using the Effective Public Health Practice Project (EPHPP) Quality Assessment Tool. A narrative summary of the study findings in relation to the research questions was produced.

RESULTS

Thirty-nine studies met inclusion criteria. Overall, there was moderate evidence of the effectiveness of interventions in improving mental health outcomes in homeless women, both immediately post-intervention and at later follow-up. The strongest evidence was for the effectiveness of psychotherapy interventions. There was also evidence that homeless women find interventions aimed at improving mental health outcomes acceptable and helpful.

CONCLUSIONS

Heterogeneity in intervention and study methodology limits the ability to draw definitive conclusions about the extent to which different categories of intervention improve mental health outcomes in homeless women. Future research should focus on lesser-studied intervention categories, subgroups of homeless women and mental health outcomes. More in-depth qualitative research of factors that enhance or diminish the acceptability of mental health interventions to homeless women is also required.

Veterans' attitudes toward work and disability compensation: associations with substance abuse

INTRODUCTION

Veterans deemed disabled for conditions resulting from, or aggravated by, their service in the military are eligible for service-connected disability payments. Despite many positive effects of disability payments, one concern is that Veterans with psychiatric conditions who receive disability payments are less likely to be employed compared to those who are denied benefits. Little is known about the attitudes of substance using Veterans, for whom work is a particularly important part of recovery, toward work and disability compensation.

METHODS

This study compared the responses of Veterans with (n=33) and without substance use problems (n=51) to questions about work's significance and its relationship to disability payments. T- and chi-square tests were conducted to determine if Veterans with substance use problems differed from the others on work-related attitudes and perceptions of the relation between work and Veterans' benefits.

RESULTS

Veterans endorsed high levels of agreement with statements that working would lead to loss of benefits. Veterans with substance use agreed more strongly that they would rather turn down a job offer than lose financial benefits.

CONCLUSIONS

The greater preference for disability payments among substance-using Veterans may reflect a realistic concern that they are particularly likely to have difficulty maintaining employment. The widespread concern among Veterans that work will lead to loss of VA disability payments is striking given the ambiguity about how likely loss of benefits actually is, and should be addressed during the service-connection application process.

Homelessness in schizophrenia

The impact of mental illness, comorbid substance abuse, and medication nonadherence, coupled with disjointed psychiatric and social services, conspires to a disproportionately high rate of psychiatric disorders among people who are homeless in the United States. This article reviews the prevalence of homeless among the mentally ill as well as the prevalence of mental illness among the homeless and details barriers in access to care and the solutions that have been attempted. The need and solutions to introduce a new generation of physicians and allied health care workers to the unique health care needs of the homeless population are highlighted.

Effectiveness of interventions to improve the health and housing status of homeless people: a rapid systematic review

BACKGROUND

Research on interventions to positively impact health and housing status of people who are homeless has received substantially increased attention over the past 5 years. This rapid review examines recent evidence regarding interventions that have been shown to improve the health of homeless people, with particular focus on the effect of these interventions on housing status.

METHODS

A total of 1,546 articles were identified by a structured search of five electronic databases, a hand search of grey literature and relevant journals, and contact with experts. Two reviewers independently screened the first 10% of titles and abstracts for relevance. Inter-rater reliability was high and as a result only one reviewer screened the remaining titles and abstracts. Articles were included if they were published between January 2004 and December 2009 and examined the effectiveness of an intervention to improve the health or healthcare utilization of people who were homeless, marginally housed, or at risk of homelessness. Two reviewers independently scored all relevant articles for quality.

RESULTS

Eighty-four relevant studies were identified; none were of strong quality while ten were rated of moderate quality. For homeless people with mental illness, provision of housing upon hospital discharge was effective in improving sustained housing. For homeless people with substance abuse issues or concurrent disorders, provision of housing was associated with decreased substance use, relapses from periods of substance abstinence, and health services utilization, and increased housing tenure. Abstinent dependent housing was more effective in supporting housing status, substance abstinence, and improved psychiatric outcomes than non-abstinence dependent housing or no housing. Provision of housing also improved health outcomes among homeless populations with HIV. Health promotion programs can decrease risk behaviours among homeless populations.

CONCLUSIONS

These studies provide important new evidence regarding interventions to improve health, housing status, and access to healthcare for homeless populations. The additional studies included in this current review provide further support for earlier evidence which found that coordinated treatment programs for homeless persons with concurrent mental illness and substance misuse issues usually result in better health and access to healthcare than usual care. This review also provides a synthesis of existing evidence regarding interventions that specifically support homeless populations with HIV.

Patient and program predictors of 12-month outcomes for homeless veterans following discharge from time-limited residential treatment

The U.S. Department of Veterans Affairs provides transitional residential treatment to homeless veterans through three types of programs: VA-staffed Domiciliary care, and two types of community-based treatment (one funded through locally managed contracts and the other through national grants). This study compared treatment process and outcomes in these three programs and also sought to identify differences in outcome between dually diagnosed veterans, veterans with substance abuse problems or psychiatric problems alone, and those with no psychiatric diagnoses. Altogether, 1,338 veterans admitted to the 3 types of program were recruited to participate in a prospective naturalistic study which evaluated housing, clinical and community adjustment outcomes during the year following discharge. Data on 1,003 veterans for whom psychiatric diagnostic, social climate and length of stay data were available were used to compare participants in the three program types at baseline. Regression models were used to compare outcomes across program and diagnostic types net of baseline differences between study participants, and of differences in social climate and length of stay. The overall follow-up rate across all time points was 72%. Significant differences across programs were observed on only 2 baseline measures as well as on several baseline values of the outcome measures, length of stay and a measure of social climate. Adjusting for veteran baseline differences alone there were no differences in outcomes by program after correction for multiple comparisons. Dually diagnosed veterans had poorer mental health and overall quality of life outcomes. Longer length of stay and more positive social climate were associated with superior outcomes on several measures. The adjusted mean estimate of the proportion of veterans housed at 12 months follow-up was 78%, similar to published outcomes for supported housing. Length of stay, rather than program funding configuration or diagnostic group, was the strongest predictor of outcomes in time-limited residential treatment programs in which 1-year housing was similar to those in direct-placement supported housing programs.

Improving treatment adherence in patients with bipolar disorder and substance abuse: rationale and initial development of a novel psychosocial approach

Patients with comorbid bipolar and substance use disorders are at particularly high risk for treatment nonadherence and a host of negative consequences. However, no previous interventions have been designed specifically to address this problem. In the current study, we describe the rationale for and initial development of an adjunctive psychosocial intervention that targets adherence in patients with bipolar disorder who are substance abusers. The intervention involves brief in-person sessions and follow-up phone contacts with the patient and a significant other/family member. We describe the effects of this novel intervention on adherence and other psychiatric outcomes in a series of cases treated as part of our initial development work. Results suggest that the intervention is feasible and acceptable to patients and could be helpful in enhancing the effects of existing treatments. Given these promising results, we plan to test the intervention further in a randomized clinical trial.

Consequences of eliminating federal disability benefits for substance abusers

Using annual, repeated cross-sections from national household surveys, we estimate how the January 1997 termination of federal disability insurance, Supplemental Security Income (SSI), for those with Drug Addiction and Alcoholism affected labor market outcomes among individuals targeted by the legislation. We also examine whether the policy change affected health insurance, health care utilization, and arrests. We employ propensity-score methods to address differences in observed characteristics between likely substance users and others, and we used a difference-in-difference-in-difference approach to mitigate potential omitted variables bias. In the short-run (1997-1998), declines in SSI receipt accompanied appreciable increases in labor force participation and current employment. There was little measurable effect of the policy change on insurance and utilization, but we have limited power to detect effects on these outcomes. In the later period after the policy change (1999-2002), the rate of SSI receipt rose, and short-run gains in labor market outcomes diminished.

Lessening Homelessness Among Persons with Mental Illness: A Comparison of Five Randomized Treatment Trials

We evaluate the influence of housing, services, and individual characteristics on housing loss among formerly homeless mentally ill persons who participated in a five-site (4-city) study in the U.S. Housing and service availability were manipulated within randomized experimental designs and substance abuse and other covariates were measured with a common protocol. Findings indicate that housing availability was the primary predictor of subsequent ability to avoid homelessness, while enhanced services reduced the risk of homelessness if housing was also available. Substance abuse increased the risk of housing loss in some conditions in some projects, but specific findings differed between projects and with respect to time spent in shelters and on the streets. We identify implications for research on homeless persons with mental illness that spans different national and local contexts and involves diverse ethnic groups.

Improving treatment adherence in bipolar disorder: a review of current psychosocial treatment efficacy and recommendations for future treatment development

Treatment adherence is a frequent problem in bipolar disorder, with research showing that more than 60% of bipolar patients are at least partially nonadherent to medications. Treatment nonadherence is consistently predictive of a number of negative outcomes in bipolar samples, and the discontinuation of mood stabilizers places these patients at high risk for relapse. Several types of adjunctive treatment (family, psychoeducational, cognitive-behavioral) have been investigated for improving symptoms and functioning in bipolar patients with some success. To date, less attention has been paid to developing treatments specifically to promote treatment adherence to and engagement with pharmacological as well as behavioral treatments in patients with bipolar disorder. First, we review the effects of adjunctive interventions specifically on treatment adherence outcomes in 14 published clinical trials. Based on this empirical knowledge base, we present a preliminary description of the treatment strategies that appear most promising for improving adherence. The article also provides research recommendations for developing more effective interventions for the purpose of improving bipolar treatment adherence. Finally, special treatment considerations, including the potential impact of comorbid substance abuse and bipolar depression, are discussed.

Schizophrenia housing and supportive relationships

Schizophrenia can be a very disabling illness that affects between 0.5% and 1% of the population. This illness has a great personal impact on the individual sufferer, their family and friends. In addition, it makes significant demands on health services and the community in general. This paper reviews the literature on housing and supportive relationships for people with schizophrenia. The literature reports that people's experience of their schizophrenia is that it not only causes symptoms, but often impacts on their ability to maintain the basic resources in life. These resources include the ability to maintain reasonable quality housing, which seems to further impact negatively on their illness and their ability to maintain supportive social relationships. People with schizophrenia (and people in general) rely on their social relationships and family to maintain their mental health. The loss of social relationships and inability to maintain quality housing seem to be related - if people cannot maintain quality housing, they find it difficult to maintain supportive social relationships.

Factors associated with receipt of pension and compensation benefits for homeless veterans in the VBA/VHA Homeless Outreach Initiative

Public support payments may facilitate exit from homelessness for persons with mental illness. We examined data from 10,641 homeless veterans contacted from October 1, 1995 to September 30, 2002 in a collaborative outreach program designed to facilitate access to Department of Veterans Affairs (VA) disability benefits. Those who were awarded benefits (22% of contacted veterans) were more likely to report disability, poor to fair self-rated health, and were more likely to have used VA services in the past. Thus, this program achieved only modest success and was most successful with veterans who were already receiving VA services and who might have received benefits even without the outreach effort.

Disability benefits and clinical outcomes among homeless veterans with psychiatric and substance abuse problems

This study examined the relationship between disability payment status and clinical outcomes among 305 homeless veterans entering VA treatment. Disability status and clinical outcomes were characterized using self-report data at program entry, and quarterly for 2 years thereafter. Seeking or already receiving disability benefits at program entry was not associated with any of the 8 clinical outcomes examined. Those seeking or receiving disability benefits during the 2 years that followed showed more serious mental health problems and lower levels of mental health functioning, but no greater risk of substance use or not being employed nor worse housing outcomes than those who remained uninterested in applying for disability benefits. This study does not, therefore, support the notion that disability orientation results in poorer clinical outcomes, at least not among homeless veterans.

Housing, social support and people with schizophrenia: a grounded theory study

The aim of this study was to develop a substantive grounded theory describing the relationship among housing, social support, and the mental health of people with schizophrenia. To achieve this aim, data were collected from people with schizophrenia living in boarding houses and living in their own home. Semi-structured in-depth interviews were conducted with 13 people with schizophrenia to explore their experiences and views regarding the impact of their housing on their mental health. Findings indicate a strong desire among all participants to live in their own home. When they do they feel they belong, they feel safe and most importantly they have greater opportunities to make and maintain supportive social relationships.

Regional Variation and Other Correlates of Department of Veterans Affairs Disability Awards for Patients With Posttraumatic Stress Disorder

BACKGROUND

Minnesota, Minneapolis, Minnesota. Posttraumatic stress disorder (PTSD) is a chronic disabling condition affecting more than 600,000 United States veterans and is the most common psychiatric condition for which veterans seek Veterans Affairs disability benefits. Receipt of such benefits enhances veterans' access to Veteran Affairs health care and reduces their chance of poverty.

OBJECTIVES

We sought to determine whether previously identified regional variations in PTSD disability awards are explained by appropriate subject characteristics (eg, differences in PTSD symptomatology or dysfunction) and to estimate the impact of veterans' PTSD symptom severity or level of dysfunction on their odds of obtaining PTSD disability benefits.

RESEARCH DESIGN

We used a mailed survey linked to administrative data.

SUBJECTS

Subjects included 4918 representative, eligible men and women who filed PTSD disability claims between 1994 and 1998.

RESULTS

A total of 3337 veterans returned useable surveys (68%). Before adjustment, PTSD disability claims approval rates ranged from 43% to 75% across regions. After adjustment, rates ranged from 33% to 72% (P <0.0001). Severer PTSD symptoms were associated with greater odds of having PTSD disability benefits (P <0.0001). Unexpectedly, poorer functional status was associated with lower odds of having benefits (P <0.0001). On average, clinical differences between veterans who did and did not have PTSD disability benefits were small but suggested slightly greater dysfunction among those without benefits.

CONCLUSIONS

An almost twofold regional difference in claims approval rates was not explained by veterans' PTSD symptom severity, level of dysfunction, or other subject-level characteristics. Veterans who did not obtain PTSD disability benefits were at least as disabled as those who did receive benefits.

The cost-effectiveness of independent housing for the chronically mentally ill: do housing and neighborhood features matter?

OBJECTIVE

To determine the effects of housing and neighborhood features on residential instability and the costs of mental health services for individuals with chronic mental illness (CMI).

DATA SOURCES

Medicaid and service provider data on the mental health service utilization of 670 individuals with CMI between 1988 and 1993 were combined with primary data on housing attributes and costs, as well as census data on neighborhood characteristics. Study participants were living in independent housing units developed under the Robert Wood Johnson Foundation Program on Chronic Mental Illness in four of nine demonstration cities between 1988 and 1993.

STUDY DESIGN

Participants were assigned on a first-come, first-served basis to housing units as they became available for occupancy after renovation by the housing providers. Multivariate statistical models are used to examine the relationship between features of the residential environment and three outcomes that were measured during the participant's occupancy in a study property: residential instability, community-based service costs, and hospital-based service costs. To assess cost-effectiveness, the mental health care cost savings associated with some residential features are compared with the cost of providing housing with these features.

DATA COLLECTION/EXTRACTION METHODS

Health service utilization data were obtained from Medicaid and from state and local departments of mental health. Non-mental-health services, substance abuse services, and pharmaceuticals were screened out.

PRINCIPAL FINDINGS

Study participants living in newer and properly maintained buildings had lower mental health care costs and residential instability. Buildings with a richer set of amenity features, neighborhoods with no outward signs of physical deterioration, and neighborhoods with newer housing stock were also associated with reduced mental health care costs. Study participants were more residentially stable in buildings with fewer units and where a greater proportion of tenants were other individuals with CMI. Mental health care costs and residential instability tend to be reduced in neighborhoods with many nonresidential land uses and a higher proportion of renters. Mixed-race neighborhoods are associated with reduced probability of mental health hospitalization, but they also are associated with much higher hospitalization costs if hospitalized. The degree of income mixing in the neighborhood has no effect.

CONCLUSIONS

Several of the key findings are consistent with theoretical expectations that higher-quality housing and neighborhoods lead to better mental health outcomes among individuals with CMI. The mental health care cost savings associated with these favorable features far outweigh the costs of developing and operating properties with them. Support for the hypothesis that "diverse-disorganized" neighborhoods are more accepting of individuals with CMI and, hence, associated with better mental health outcomes, is mixed.

Opportunities for an improved role for nurses in psychoactive substance use: Review of the literature

Nurses form a core component of many health care systems so their role in responding to problems related to psychoactive substance use is crucial. They are often under-utilized, mainly because of anxieties concerning role adequacy, legitimacy, lack of support and failure to implement interventions in a variety of settings. Nurses have unique opportunities through interactions they have with young people, families and significant others. Training and career preparation should encompass development of innovative strategies, taking a leading role in management of substance use patients, involvement in the treatment of the homeless mentally ill, HIV-infected individuals and persons with dual disorders of mental health and substance use. Future directions should focus on developing skills for critical thinking, preventive and therapeutic interventions, clinical judgement, effective organizational capacity and team work. Barriers such as scope of practice, authority, ethical and legal issues surrounding health care for substance use need to be addressed.

Tackling the needs of the homeless: a controlled trial of health advocacy

The objective of the present study was to assess the effectiveness of a health advocate's casework with homeless people in a primary care setting in terms of improvements in health-related quality of life (QoL). The impact of the health advocacy intervention was assessed in a quasi-experimental, three-armed controlled trial. Homeless people moving into hostels or other temporary accommodation in the Liverpool 8 area of the UK and patients registering at an inner-city health centre as temporary residents were allocated in alternating periods to health advocacy (with or without outreach registration) or 'usual care' over a total intake period of 3 years. Health-related QoL outcomes were assessed using three independent self-report measures: the Life Fulfilment Scale; the Delighted-Terrible Faces Scale; and the Nottingham Health Profile. Out of the 326 homeless people who were given baseline questionnaires at registration, 222 (68%) returned usable questionnaires. Out of these individuals, 171 (77.0%) were traceable at follow-up, and 117 (68.4%) follow-up questionnaires were returned. The majority of respondents (n = 117) were women (72%) who were under 30 years of age (74%), white British (91%), and single (63%) or separated (23%), many of whom were living with their children (41%) in either women's refuges (30%) or family hostels (25%). Improvements in health-related QoL were greatest in people recruited and supported by a health advocate early in their stay in temporary housing, in comparison with those in the control group given 'usual care' at the health centre. The model of streamlined care for patients with complex psycho-social needs is shown to be a worthwhile and effective option for primary healthcare providers.

Racial disparities in VA service connection for posttraumatic stress disorder disability

BACKGROUND

"Service connected" veterans are those with documented, compensative conditions related to or aggravated by military service, and they receive priority for enrollment into the Veterans Affairs (VA) health care system. For some veterans, service connection represents the difference between access to VA health care facilities and no access.

OBJECTIVES

To determine whether there are racial discrepancies in the granting of service connection for posttraumatic stress disorder (PTSD) by the Department of Veterans Affairs and, if so, to determine whether these discrepancies could be attributed to appropriate subject characteristics, such as differences in PTSD symptom severity or functional status.

RESEARCH DESIGN

Mailed survey linked to administrative data. Claims audits were conducted on 11% of the sample.

SETTING AND SUBJECTS

The study comprised 2700 men and 2700 women randomly selected from all veterans filing PTSD disability claims between January 1, 1994 and December 31, 1998.

RESULTS

A total of 3337 veterans returned usable surveys, of which 17% were black. Only 16% of respondents carried private health insurance, and 44% reported incomes of 20,000 US dollars or less. After adjusting for respondents' sociodemographic characteristics, symptom severity, functional status, and trauma histories, black persons' rate of service connection for PTSD was 43% compared with 56% for other respondents (P = 0.003).

CONCLUSION

Black persons' rates of service connection for PTSD were substantially lower than other veterans even after adjusting for differences in PTSD severity and functional status.

Evaluation methods for social intervention

Experimental design is the method of choice for establishing whether social interventions have the intended effects on the populations they are presumed to benefit. Experience with field experiments, however, has revealed significant limitations relating chiefly to (a) practical problems implementing random assignment, (b) important uncontrolled sources of variability occurring after assignment, and (c) a low yield of information for explaining why certain effects were or were not found. In response, it is increasingly common for outcome evaluation to draw on some form of program theory and extend data collection to include descriptive information about program implementation, client characteristics, and patterns of change. These supplements often cannot be readily incorporated into standard experimental design, especially statistical analysis. An important advance in outcome evaluation is the recent development of statistical models that are able to represent individual-level change, correlates of change, and program effects in an integrated and informative manner.

Severely mentally ill patients with and without substance use disorders: characteristics associated with treatment attrition

We aimed to describe characteristics associated with attrition for patients in community mental health treatment with chronic mental illness with and without substance use disorders. Baseline assessments included symptom severity, treatment satisfaction, social support, and a structured diagnostic interview. Treatment attrition was assessed at six months. At six months, 36% of the dual diagnosis group (n = 25), and 61% of the mental illness alone group (n = 23) were lost to follow-up. Attrition in the dually diagnosed group tended to be associated with less satisfaction with treatment, and higher mean symptom scores. There were no characteristics associated with attrition in the group of patients with mental illness alone. However, client satisfaction tended to increase among the mental illness alone patients that were successfully followed. The dually diagnosed group that remained in treatment had a significantly lower mean treatment satisfaction score than the mental illness alone group at six months. This type of investigation should aid in patient care and evaluation of treatment programs for persons with severe mental illness and co-occurring substance use disorders.

Street outreach for homeless persons with serious mental illness: is it effective?

OBJECTIVES

This study examined data on case management clients who are homeless and have a severe mental illness to determine how those contacted through street outreach differ in their socio-demographic characteristics, service needs, and outcomes from those clients contacted in shelters and other health and social service agencies.

METHODS

As part of the Center for Mental Health Services' Access to Community Care and Effective Services and Supports (ACCESS) program, data were obtained from potential clients over the first 3 years of the program at the time of the first outreach contact (n = 11,857), at the time of enrollment in the case management program (n = 5,431), and 3 months after enrollment (n = 4,587).

RESULTS

Clients contacted at outreach on the street, as opposed to being contacted in shelters and service agencies, were generally worse off. They were more likely to be male, to be older, to spend more nights literally homeless before the contact, to have psychotic disorders, and took longer to engage in case management. They expressed less interest in treatment and were less likely to enroll in the case management phase of the project. Subjects contacted on the street who did enroll were more impaired than their street counterparts who did not enroll. Three month outcome data showed that enrolled clients contacted through street outreach showed improvement that was equivalent to those enrolled clients contacted in shelters and other service agencies on nearly all outcome measures.

CONCLUSION

Street outreach to homeless persons with serious mental illness is justified as these clients are more severely impaired, have more basic service needs, are less motivated to seek treatment, and take longer to engage than those contacted in other settings. Street outreach is further justified as it engages the most severely impaired among the street population. Street outreach also appears to be effective as the clients reached in this way showed improvement equal to that of other clients in most outcome domains when baseline differences were taken into account.

The productivity of mental health care: an instrumental variable approach

BACKGROUND: Like many other medical technologies and treatments, there is a lack of reliable evidence on treatment effectiveness of mental health care. Increasingly, data from non-experimental settings are being used to study the effect of treatment. However, as in a number of studies using non-experimental data, a simple regression of outcome on treatment shows a puzzling negative and significant impact of mental health care on the improvement of mental health status, even after including a large number of potential control variables. The central problem in interpreting evidence from real-world or non-experimental settings is, therefore, the potential "selection bias" problem in observational data set. In other words, the choice/quantity of mental health care may be correlated with other variables, particularly unobserved variables, that influence outcome and this may lead to a bias in the estimate of the effect of care in conventional models. AIMS OF THE STUDY: This paper addresses the issue of estimating treatment effects using an observational data set. The information in a mental health data set obtained from two waves of data in Puerto Rico is explored. The results using conventional models - in which the potential selection bias is not controlled - and that from instrumental variable (IV) models - which is what was proposed in this study to correct for the contaminated estimation from conventional models - are compared. METHODS: Treatment effectiveness is estimated in a production function framework. Effectiveness is measured as the improvement in mental health status. To control for the potential selection bias problem, IV approaches are employed. The essence of the IV method is to use one or more instruments, which are observable factors that influence treatment but do not directly affect patient outcomes, to isolate the effect of treatment variation that is independent of unobserved patient characteristics. The data used in this study are the first (1992-1993) and second (1993-1994) wave of the ongoing longitudinal study Mental Health Care Utilization Among Puerto Ricans, which includes information for an island-wide probability sample of over 3000 adults living in poor areas of Puerto Rico. The instrumental variables employed in this study are travel distance and health insurance sources. RESULTS: It is very noticeable that in this study, treatment effects were found to be negative in all conventional models (in some cases, highly significant). However, after the IV method was applied, the estimated marginal effects of treatment became positive. Sensitivity analysis partly supports this conclusion. According to the IV estimation results, treatment is productive for the group in most need of mental health care. However, estimations do not find strong enough evidence to demonstrate treatment effects on other groups with less or no need. The results in this paper also suggest an important impact of the following factors on the probability of improvement in mental health status: baseline mental health status, previous treatment, sex, marital status and education. DISCUSSION: The IV approach provides a practical way to reduce the selection bias due to the confounding of treatment with unmeasured variables. The limitation of this study is that the instruments explored did not perform well enough in some IV equations, therefore the predictive power remains questionable. The most challenging part of applying the IV approach is on finding "good" instruments which influence the choice/quantity of treatment yet do not introduce further bias by being directly correlated with treatment outcome. CONCLUSIONS: The results in this paper are supportive of the concerns on the credibility of evaluation results using observation data set when the endogeneity of the treatment variable is not controlled. Unobserved factors contribute to the downward bias in the conventional models. The IV approach is shown to be an appropriate method to reduce the selection bias for the group in most need for mental health care, which is also the group of most policy and treatment concern. IMPLICATIONS FOR HEALTH CARE PROVISION AND USE: The results of this work have implications for resource allocation in mental health care. Evidence is found that mental health care provided in Puerto Rico is productive, and is most helpful for persons in most need for mental health care. According to what estimated from the IV models, on the margin, receiving formal mental health care significantly increases the probability of obtaining a better mental health outcome by 19.2%, and one unit increase in formal treatment increased the probability of becoming healthier by 6.2% to 8.4%. Consistent with other mental health literature, an individual's baseline mental health status is found to be significantly related to the probability of improvement in mental health status: individuals with previous treatment history are less likely to improve. Among demographic factors included in the production function, being female, married, and high education were found to contribute to a higher probability of improvement. IMPLICATION FOR FURTHER RESEARCH: In order to provide accurate evidence of treatment effectiveness of medical technologies to support decision making, it is important that the selection bias be controlled as rigorously as possible when using information from a non-experimental setting. More data and a longer panel are also needed to provide more valid evidence. tion.

Improving access to disability benefits among homeless persons with mental illness: an agency-specific approach to services integration

OBJECTIVES

This study evaluated a joint initiative of the Social Security Administration (SSA) and the Department of Veterans Affairs (VA) to improve access to Social Security disability benefits among homeless veterans with mental illness.

METHODS

Social Security personnel were colocated with VA clinical staff at 4 of the VA's Health Care for Homeless Veterans (HCHV) programs. Intake assessment data were merged with SSA administrative data to determine the proportion of veterans who filed applications and who received disability awards at the 4 SSA-VA Joint Outreach Initiative sites (n = 6709) and at 34 comparison HCHV sites (n = 27 722) during the 2 years before and after implementation of the program.

RESULTS

During the 2 years after the initiative began, higher proportions of veterans applied for disability (18.9% vs 11.1%; P < .001) and were awarded benefits (11.4% vs 7.2%, P < .001) at SSA-VA Joint Initiative sites.

CONCLUSION

A colocation approach to service system integration can improve access to disability entitlements among homeless persons with mental illness. Almost twice as many veterans were eligible for this entitlement as received it through a standard outreach program.

Evaluating and improving VA substance abuse patients' care

The VA has implemented a nationwide evaluation program to monitor process and outcome of care for substance abuse patients. This program focuses on the changing characteristics of VA substance abuse patients and treatment services and involves outcome-based evaluations of major VA substance abuse treatment modalities. Initial findings show that VA substance abuse patients, including patients with concomitant psychiatric disorders, improve substantially from treatment intake to a 1-year follow-up and that community residential facilities are an important part of the continuum of substance abuse care. Moreover, within broad limits, there is a dose-response relationship between the continuity of outpatient mental health care and better 1-year substance use and psychosocial outcomes. These findings are placed into context as part of an evidence-based initiative to improve the quality of VA mental health care.

Homelessness: health service use and related costs

OBJECTIVES

This study examines health service use and costs for homeless and domiciled veterans hospitalized in psychiatric and substance abuse units at Department of Veterans Affairs (VA) medical centers, nationwide.

METHODS

A national survey of residential status at the time of admission was conducted on all VA inpatients hospitalized in acute mental health care units on September 30, 1995. Survey data were merged with computerized workload data bases to assess service use and cost during the 6 months before and after the date of discharge from the index hospitalization.

RESULTS

Of 9,108 veterans with complete survey data, 1,797 (20%) had been literally homeless at the time of admission, and 1,380 (15%) were doubled up temporarily, for a total homelessness rate of 35%. Combining patients from general psychiatry and substance abuse programs, the average annual cost of care for homeless veterans, after adjusting for other factors, was $27,206; $3,196 (13.3%) higher than the cost of care for domiciled veterans (P < 0.0001). Approximately 26% of annual inpatient VA mental health expenditures ($404 million) are spent on the care of homeless persons.

CONCLUSIONS

Homelessness adds substantially to the cost of health care services for persons with mental illness in VA, and most likely, in other "safety net" systems that serve the poor. These high costs, along with the prospect of declining public funding for health and social welfare programs, and an anticipated increase in the numbers of homeless mentally ill persons, portend a difficult time ahead for both homeless patients and the organizations that care for them.

Individual and community-level variation in intensity and diversity of service utilization by homeless persons with serious mental illness

This study examines individual client- and community-level sources of variation in service use among clients entering 18 community treatment programs for homeless mentally ill persons as part of a national demonstration project. Assessment data on 1,828 clients were used to evaluate the relationship of a) individual client characteristics and b) site of entry, to both the intensity and diversity of service use. Hierarchical multiple regression was used to identify the relative importance of client characteristics and site of entry. Client characteristics explained only 2% to 3% of the variance in service use. Inter-site variation accounted for 2 to 3 times as much of the variance. Inter-site differences account for substantially more of the variance in service use among homeless persons with mental illness than individual client characteristics. Further studies are needed to identify specific community-level factors that account for these variations.