Antisocial personality disorder predicts methamphetamine treatment outcomes in homeless, substance-dependent men who have sex with men

The effectiveness of psychosocial interventions for reducing problematic substance use, mental ill health, and housing instability in people experiencing homelessness in high income countries: A systematic review and meta-analysis

Background

Adults experiencing homelessness in high income countries often also face issues of problematic substance use, mental ill health, in addition to housing instability, so it is important to understand what interventions might help address these issues. While there is growing evidence of the effectiveness of psychosocial interventions for the general population, limited evidence exists specifically for those experiencing homelessness.

Objectives

To summarise the existing evidence of whether psychosocial interventions work in reducing problematic substance use, mental ill health, and housing instability for adults experiencing homelessness in high income countries.

Search Methods

We used searches undertaken for the Homelessness Effectiveness Evidence and Gap Map (EGM) 5th edition. These were supplemented with hand searches of key journals and a call for evidence.

Selection Criteria

We included all Randomised Control Trials and non-randomised studies where a comparison group was used and which examined psychosocial interventiONS for adults experiencing homelessness. 'Psychosocial intervention' is a broad term and covers several interventions, including cognitive behavioural therapy (CBT), contingency management, and motivational interviewing. We focused on studies that measure at least one of three outcomes: reduction in problematic substance use (alcohol and/or drugs); reduction in mental ill-health; reduction in housing instability.

Data Collection and Analysis

For included studies sourced from the EGM, we used the risk of bias assessments reported in the EGM. For included studies sourced from our own searches, we used the same tools used in the EGM to undertake our own assessments. We carried out meta-analysis where possible, and where not possible, presented included studies narratively.

Findings

We included 26 papers covering 23 individual intervention studies. All of the included studies were from the United States. Of the 26 papers, 14 were assessed as having medium or high risk of bias, with main issues being lack of masking/blinding, lack of power calculations, and high levels of drop-out.

Effectiveness of Psychosocial Interventions

We found that psychosocial interventions overall were better than standard care (-0.25 SD, 95% confidence intervals [CI] [-0.36, -0.13]). This finding covered six different interventions and was subject to a high level of between-study differences (heterogeneity). We also found that psychosocial interventions were more effective than standard care in relation to all three of our outcomes of interest, although were statistically significant only for substance abuse and mental ill-health. For substance use, we found an average effect size of (-0.34 SD, 95% CI [-0.48, -0.21]); for mental ill health of (-0.18 SD, 95% CI [-0.34, -0.01]); and for housing instability of (-0.10 SD, 95% [-0.90, 0.70]).

Effectiveness of Individual Psychosocial Interventions

We were able to undertake five meta-analyses (statistical summaries) with respect to four types of intervention: CBT, Contingency Management, Motivational Interviewing, and Brief Motivational Interventions, in relation to specific outcomes. Of these five analyses, we found significant effects for the effectiveness of Contingency Management in reducing problematic substance use (-0.49 SD, 95% CI [-0.85, -0.14]), and of Motivational Interviewing in reducing mental ill-health (-0.19 SD, 95% CI [-0.26, -0.12]). We also found non-significant effects in relation to CBT and reducing mental ill health (-0.30 SD, 95% CI [-0.61, 0.002]), Motivational Interviewing and reducing problematic substance use (-0.27 SD, 95% CI [-0.56, 0.01]), and Brief Motivational Interventions and reducing problematic substance use (-0.24 SD, 95% CI [-0.61, 0.13]). Meta-analysis was not possible for any other interventions or outcomes.

Author Conclusions

This systematic review sought to understand the effectiveness of psychosocial interventions for adults in high income countries experiencing homelessness, for reducing problematic substance use, reducing mental ill-health, and increasing housing stability. The review shows potential benefits of these interventions, with some encouraging results for some interventions and outcomes. Where we could calculate effect sizes, these were often small and, in many cases, crossed the line of no effect (i.e., there is a chance that they are equally or less effective than treatment as usual). Significant heterogeneity between studies and high rates of drop-out in many studies reduces the confidence in the interventions.There are some limitations with the evidence base. The included studies were entirely from the United States. There was a clear gender bias in the included studies, with nearly two-thirds of participants being men. (This is despite 4 of the 26 included studies focusing on women only.) We also found that the theoretical basis for the approach of interventions was not sufficiently considered, so it was difficult to understand why the intervention expected the outcomes they measured. Finally, many of the studies included were assessed as having high or medium risk of bias.

The effectiveness of abstinence-based and harm reduction-based interventions in reducing problematic substance use in adults who are experiencing homelessness in high income countries: A systematic review and meta-analysis: A systematic review

Background

Homelessness is a traumatic experience, and can have a devastating effect on those experiencing it. People who are homeless often face significant barriers when accessing public services, and have often experienced adverse childhood events, extreme social disadvantage, physical, emotional and sexual abuse, neglect, low self-esteem, poor physical and mental health, and much lower life expectancy compared to the general population. Rates of problematic substance use are disproportionately high, with many using drugs and alcohol to deal with the stress of living on the street, to keep warm, or to block out memories of previous abuse or trauma. Substance dependency can also create barriers to successful transition to stable housing.

Objectives

To understand the effectiveness of different substance use interventions for adults experiencing homelessness.

Search Methods

The primary source of studies for was the 4th edition of the Homelessness Effectiveness Studies Evidence and Gaps Maps (EGM). Searches for the EGM were completed in September 2021. Other potential studies were identified through a call for grey evidence, hand-searching key journals, and unpacking relevant systematic reviews.

Selection Criteria

Eligible studies were impact evaluations that involved some comparison group. We included studies that tested the effectiveness of substance use interventions, and measured substance use outcomes, for adults experiencing homelessness in high income countries.

Data Collection and Analysis

Descriptive characteristics and statistical information in included studies were coded and checked by at least two members of the review team. Studies selected for the review were assessed for confidence in the findings. Standardised effect sizes were calculated and, if a study did not provide sufficient raw data for the calculation of an effect size, author(s) were contacted to obtain these data. We used random-effects meta-analysis and robust-variance estimation procedures to synthesise effect sizes. If a study included multiple effects, we carried out a critical assessment to determine (even if only theoretically) whether the effects are likely to be dependent. Where dependent effects were identified, we used robust variance estimation to determine whether we can account for these. Where effect sizes were converted from a binary to continuous measure (or vice versa), we undertook a sensitivity analysis by running an additional analysis with these studies omitted. We also assessed the sensitivity of results to inclusion of non-randomised studies and studies classified as low confidence in findings. All included an assessment of statistical heterogeneity. Finally, we undertook analysis to assess whether publication bias was likely to be a factor in our findings. For those studies that we were unable to include in meta-analysis, we have provided a narrative synthesis of the study and its findings.

Main Results

We included 48 individual papers covering 34 unique studies. The studies covered 15, 255 participants, with all but one of the studies being from the United States and Canada. Most papers were rated as low confidence (n = 25, or 52%). By far the most common reason for studies being rated as low confidence was high rates of attrition and/or differential attrition of study participants, that fell below the What Works Clearinghouse liberal attrition standard. Eleven of the included studies were rated as medium confidence and 12 studies as high confidence. The interventions included in our analysis were more effective in reducing substance use than treatment as usual, with an overall effect size of -0.11 SD (95% confidence interval [CI], -0.27, 0.05). There was substantial heterogeneity across studies, and the results were sensitive to the removal of low confidence studies (-0.21 SD, 95% CI [-0.59, 0.17] - 6 studies, 17 effect sizes), the removal of quasi-experimental studies (-0.14 SD, 95% CI [-0.30, 0.02] - 14 studies, 41 effect sizes) and the removal of studies where an effect size had been converted from a binary to a continuous outcome (-0.08 SD, 95% CI [-0.31, 0.15] - 10 studies, 31 effect sizes). This suggests that the findings are sensitive to the inclusion of lower quality studies, although unusually the average effect increases when we removed low confidence studies. The average effect for abstinence-based interventions compared to treatment-as-usual (TAU) service provision was -0.28 SD (95% CI, -0.65, 0.09) (6 studies, 15 effect sizes), and for harm reduction interventions compared to a TAU service provision is close to 0 at 0.03 SD (95% CI, -0.08, 0.14) (9 studies, 30 effect sizes). The confidence intervals for both estimates are wide and crossing zero. For both, the comparison groups are primarily abstinence-based, with the exception of two studies where the comparison group condition was unclear. We found that both Assertative Community Treatment and Intensive Case Management were no better than treatment as usual, with average effect on substance use of 0.03 SD, 95% CI [-0.07, 0.13] and -0.47 SD, 95% CI [-0.72, -0.21] 0.05 SD, 95% CI [-0.28, 0.39] respectively. These findings are consistent with wider research, and it is important to note that we only examined the effect on substance use outcomes (these interventions can be effective in terms of other outcomes). We found that CM interventions can be effective in reducing substance use compared to treatment as usual, with an average effect of -0.47 SD, 95% CI (-0.72, -0.21). All of these results need to be considered in light of the quality of the underlying evidence. There were six further interventions where we undertook narrative synthesis. These syntheses suggest that Group Work, Harm Reduction Psychotherapy, and Therapeutic Communities are effective in reducing substance use, with mixed results found for Motivational Interviewing and Talking Therapies (including Cognitive Behavioural Therapy). The narrative synthesis suggested that Residential Rehabilitation was no better than treatment as usual in terms of reducing substance use for our population of interest.

Authors' Conclusions

Although our analysis of harm reduction versus treatment as usual, abstinence versus treatment as usual, and harm reduction versus abstinence suggests that these different approaches make little real difference to the outcomes achieved in comparison to treatment as usual. The findings suggest that some individual interventions are more effective than others. The overall low quality of the primary studies suggests that further primary impact research could be beneficial.

Homeless people: a review of personality disorders

Personality disorders in homeless people pose a challenge to the medical community and society, requiring specialized approaches for these super-difficult patients. The prevalence of personality disorders is higher in homeless populations than in the general population. However, there is a knowledge gap regarding personality disorders among people experiencing homelessness, and the implications of this lack of recognition are substantial. This paper provides a brief narrative review of personality disorders among homeless individuals. The primary importance and specificity of these disorders in this population remain unexplored. We searched PubMed and Web of Science databases in February and November 2023 using the keywords 'homeless' and 'personality disorder', and selected fifty-eight studies to be included in this literature review. The main themes of the results were personality disorders in homeless individuals and comorbid psychiatric disorders; risk factors and other psychological and behavioral data; clinical and intervention outcomes; and challenges linked to assessment, treatment, and intervention. The homeless population experiences significant diagnostic variability and the diagnosis of personality disorders is still evolving, contributing to difficulties in diagnosis, assessment, and treatment. A future challenge is to raise clinical awareness and optimize research knowledge, assessment, and intervention in personality disorders among homeless individuals with comorbid psychiatric disorders.

Using financial incentives to improve health service engagement and outcomes of adults experiencing homelessness: A scoping review of the literature

People experiencing homelessness (PEH) have high rates of acute and chronic health conditions, complex support needs and often face multiple barriers to accessing health services. Financial incentive (FI) interventions have been found effective in improving service engagement and health outcomes for a range of health conditions, populations and settings, but little is known about their impact on PEH. We conducted a scoping review to explore the impact of FI interventions on treatment retention, adherence and other health outcomes of PEH. We searched seven electronic databases from inception to September 2021 to identify peer-reviewed published English language studies that used FI interventions with adult PEH. A scoping review methodology was used to chart relevant data uniformly. Descriptive statistics and narrative syntheses were used to describe outcomes. Thirty-three quantitative articles related to 29 primary studies were published between 1990 and 2021 and met inclusion criteria. Studies targeted three areas of health behaviour change: decreasing substance use or increasing abstinence rates, preventing or treating infectious diseases or promoting lifestyle/general health goal attainment. A variety of FIs were used (cash/non-cash, escalating/fixed schedule, larger/smaller amounts, some/all behaviours rewarded, certain/uncertain reward) across studies. Twenty-six of the primary studies reported significantly better outcomes for the participants receiving FI compared to controls. There were mixed findings about the efficacy of cash versus non-cash FIs, non-cash FIs versus other interventions and higher versus lower value of incentives. Furthermore, there was limited research about long-term outcomes and impacts. FIs have promise in increasing abstinence from substances, engagement in infectious disease treatment, retention in health services and general lifestyle modifications for PEH. Future research should examine long-term impacts and the contribution of co-interventions and intermediary lifestyle behaviour changes.

Executive Function and Contingency Management in Methamphetamine Use Disorder

OBJECTIVES

Contingency management is a promising intervention for Methamphetamine Use Disorder (MUD).Impaired executive function may decrease adherence to such treatment, but there are few data on whether impairment in executive function predicts treatment outcomes. We therefore evaluated whether baseline performance on tests of executive function predicted treatment response in a trial of contingency management for MUD.

METHODS

Thirty participants with MUD and 23 healthy controls performed the Connors Continuous Performance Task (CPT) and the Trail Making Task. MUD participants then entered an 8-week contingency management trial. Participants were categorized as responders (n=17; no methamphetamine-positive urine tests) or non-responders (n=13; >1 positive test). The Kruskal-Wallis test was used to compare scores in participants with MUD and healthy controls, and in responders versus non-responders.

RESULTS

Participants withMUD performed worse than controls on the CPT (d-prime) (p=0.012); non-responders performed worse than responders (p = 0.034). Performance of MUD participants did not differ significantly from controls on the Trail Making Task B (time to completion), but variation was high with non-responders performing worse than responders (p=0.013).

CONCLUSION

These findings suggest that tests of executive function at baseline may be useful in predicting treatment response in MUD. Future work in larger samples may ultimately allow a more personalized treatment approach to methamphetamine use disorder.

Contingency management for the treatment of methamphetamine use disorder: A systematic review

Methamphetamine use continues to be an important public health problem. Contingency management is among the most effective interventions for reducing methamphetamine use. It has been more than ten years since the last systematic review of contingency management for methamphetamine use disorder. Since then, an additional ten randomized controlled trials and a variety of other studies have been completed. The present systematic review includes 27 studies. Several factors, most notably problem severity, appear to predict treatment outcome. However, the effectiveness of CM has been demonstrated in studies restricted to MSM, studies restricted to implementation in community programs, and in studies of the general population of methamphetamine users conducted in research treatment programs. There appear to be broad benefits of contingency management intervention, including greater drug abstinence, higher utilization of other treatments and medical services, and reductions in risky sexual behavior. Twenty of the twenty-one studies that reported abstinence outcomes showed an effect of contingency management on abstinence, and seven of the nine studies that reported sexual risk behavior outcomes showed an effect of contingency management in reducing risky sexual behavior. Taken together, recent evidence suggests strongly that outpatient programs that offer treatment for methamphetamine use disorder should prioritize adoption and implementation of contingency management intervention.

Beyond the tip of the iceberg: A narrative review to identify research gaps on comorbid psychiatric disorders in adolescents with methamphetamine use disorder or chronic methamphetamine use

BACKGROUND

Methamphetamine use disorder (MUD) frequently begins in adolescence, often accompanied by other psychiatric or mental disorders. Up to now, no comprehensive review about MUD and comorbid disorders in adolescents is available. We thus aimed to review the literature on comorbid mental disorders and MUD in adolescents in order to identify future research topics. Method: A PubMed search was conducted in July 2019. Relevant comorbidities were defined as attention-deficit disorder with/without hyperactivity, anxiety disorders, depression, eating disorders, post-traumatic stress disorder, psychosis, borderline personality disorder, conduct disorder and antisocial personality disorder, as well as other substance use disorders. For each comorbidity, we summarized prevalence rates, findings on comorbidity mechanisms, and recommended treatment options, if applicable. Results: Few articles focused on MUD in adolescents. Prevalence rates differed largely between comorbid disorders, with tobacco use disorder, conduct disorder, post-traumatic stress disorder, anxiety disorders, and attention-deficit disorders being the most prevalent comorbidities while eating disorders were rare. Examined onset patterns and comorbidity mechanisms indicated three groups of comorbidities: preexisting disorders self-medicated with methamphetamine, disorders induced by chronic methamphetamine use, and disorders arising due to risk factors shared with MUD. Reviewed comorbidities were frequently associated with worse treatment outcomes. Conclusions: The limited evidence is in stark contrast to the presumably high prevalence and relevance of comorbid mental disorders in adolescents with MUD. Suggestions for future research topics, informed by adult findings, include genetic vulnerabilities, biological changes, and consequences of different use patterns. Surprisingly few MUD treatment programs explicitly integrate comorbid mental disorder modules.

Interventions to address substance use and sexual risk among gay, bisexual and other men who have sex with men who use methamphetamine: A systematic review

BACKGROUND

Methamphetamine use is common among some populations of gay, bisexual and other men who have sex with men (gbMSM). This study reviewed the status of research on the efficacy of interventions that address harms among gbMSM who use methamphetamine.

METHODS

We searched MEDLINE, PsycINFO, CINAHL, Embase, Cochrane Central Register of Controlled Trials, Web of Science, and Google Scholar to identify publications from inception to October 23, 2017, that assessed an intervention addressing methamphetamine use among gbMSM.

RESULTS

Of 1896 potential studies and 935 unique articles screened for inclusion, 28 eligible studies assessed 26 different interventions in the following categories: pharmacological (n = 5); psychosocial (n = 20); harm reduction (n = 1). Given that outcome variables were measured in highly variable ways, we were unable to conduct a meta-analysis of intervention effects. However, 22 studies reported a statistically significant effect on one or more methamphetamine-related outcomes. Among 21 studies that included measures of sexual health-related outcomes, 18 reported a significant effect on one or more sexual health-related outcomes, and 15 of those reported a concurrent effect on both drug- and sexual health-related outcomes.

CONCLUSIONS

This is the first review to provide compelling evidence that integrating interventions to address both drug- and sexual-related harms for gbMSM who use methamphetamine can be efficacious. Future research should focus on identifying differential effects of various intervention approaches by social positioning, as well as prioritize future evaluations of integrated harm reduction interventions (e.g., the distribution of harm reduction kits within sexual health care settings).

Mental Health and Substance Use Disorder Comorbidity among Methamphetamine-Using Men Who have Sex with Men

Men who have sex with men (MSM) exhibit elevated rates of mental health and substance use disorder relative to their non-MSM male counterparts. Methamphetamine use in particular has been associated with both neuronal damage and mental health disorders among MSM, and this study reports on the prevalence and comorbidity of DSM-5 mental health and substance use disorders in a sample of methamphetamine-using MSM. From March 2014 through January 2015, 286 methamphetamine-using MSM enrolled in a study to reduce methamphetamine use and sexual risk behaviors. At baseline, participants demonstrated high rates of current major depressive episode (35.8%), antisocial personality disorder (23.9%), suicide risk (23.2%), obsessive-compulsive disorder (23.2%), and social phobia (20.4%), as well as methamphetamine use disorder (89.1%), marijuana use disorder (41.0%), alcohol use disorder (39.6%), cocaine use disorder (30.9%), and inhalants use disorder (15.4%). Analyses revealed significant (p < 0.05) associations between methamphetamine use disorder severity and all listed mental health disorders, as well as between alcohol use disorder and all listed mental health disorders. Mental health disorder prevalence and substance use disorder severity were both elevated, and both methamphetamine and alcohol use disorder severity were associated with increased likelihood of comorbid mental health disorder.

Prevalence Rates of Personality Disorder and Its Association With Methamphetamine Dependence in Compulsory Treatment Facilities in China

Methamphetamine use is popular and rapidly increasing in China, and the co-occurrence of personality disorders has an impact on treatment outcomes and may increase vulnerability of developing dependence. The aim of the present study was to investigate the prevalence rates of personality disorders in methamphetamine users and further explore the association between personality disorders and methamphetamine use status. Five hundred and seventy-seven male methamphetamine users were recruited. The self-developed questionnaire was used for demographics, and a Structural Clinical Interview for Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV) (SCID-I/II) was performed covering psychiatric diagnosis. Our study found the prevalence of antisocial personality disorder in male methamphetamine users was 71.4%, followed by borderline (20.2%) and obsessive-compulsive (17.9%) personality disorder. Borderline and antisocial personality disorders were found to be risk factors of methamphetamine dependence (adjusted odds ratio = 2.891, p = 0.007 and adjusted odds ratio = 1.680, p = 0.042). These findings suggested personality disorders were highly prevalent in male methamphetamine users, and the comorbidity of antisocial and borderline personality disorders are especially associated with methamphetamine dependence.

Protocol for a systematic review of psychological treatment for methamphetamine use: an analysis of methamphetamine use and mental health symptom outcomes

INTRODUCTION

People who use methamphetamine (MA) regularly, often experience symptoms of mental ill health associated with the use of the drug. These include symptoms of psychosis, depression, anxiety and also cognitive deficits. Accordingly, psychological treatments aim to reduce MA use and related problems, including symptoms of mental ill health. Although there has been a substantial body of research reporting on the evidence of effectiveness of psychological treatments for MA use, there is a paucity of research addressing the effectiveness of these treatments for coexisting symptoms of mental ill health. We aim to address this gap by providing a comprehensive overview of the evidence for psychological treatments for MA use and associated symptoms of mental ill health in experimental/controlled clinical studies. In addition, a critical evaluation of study methods and the outcomes of psychological interventions on MA use and symptoms of mental ill health will be conducted.

METHODS AND ANALYSIS

The Cochrane Handbook for Systematic Reviews of Interventions and the Preferred Reporting Items for Systematic Reviews and Meta-Analysis statement will be used to inform the methods of this review. Eight electronic peer-reviewed databases will be searched. Pilot searches have been conducted for MA literature considering controlled clinical trials only. Eligible articles will be independently assessed against inclusion criteria. Before final analyses are completed, searches will be rerun and if eligible, additional studies will be retrieved for inclusion. A quantitative synthesis of the findings will be reported where possible, and 'summary of findings' tables will be generated for each comparison. Risk ratios and 95% CI (dichotomous outcomes) will be calculated and/or effect size according to Cohen's formula (continuous outcomes) for the primary outcome of each trial.

ETHICS AND DISSEMINATION

No ethical issues are foreseen. Findings will be disseminated widely to clinicians and researchers via journal publication and conference presentation(s).

TRIAL REGISTRATION NUMBER

CRD42016043657.

Outcomes from a Homegrown HIV Prevention Program for Extremely High-risk, Substance-using Men who have Sex with Men with Multiple Health Disparities

From February 2010 through December 2014, 585 substance-using MSM were enrolled into a "homegrown" risk reduction intervention. Participants evidenced significant iterative factor reductions in the odds of substance use including alcohol (AOR=0.79) and marijuana (AOR=0.78; both p≤0.05) and marginally significant reductions in the odds of methamphetamine use (AOR=0.83; p≤0.07). Participants also evidenced significant reductions in sexual risks including the odds of reporting drug/alcohol use before or during sex (AOR=0.80) and of condomless anal intercourse (AOR=0.72; all significant at p≤0.05). Results demonstrate that the homegrown intervention was effective at reducing HIV risk behaviors among high-risk MSM.

Exacerbation of Methamphetamine Neurotoxicity in Cold and Hot Environments: Neuroprotective Effects of an Antioxidant Compound H-290/51

In this study, we examined the influence of cold and hot environments on methamphetamine (METH) neurotoxicity in both drug-naive rats and animals previously exposed to different types of nanoparticles (NPs). Since METH induces oxidative stress, we also examined how a potential chain-breaking antioxidant H-290/51 (Astra-Zeneca, Mölndal, Sweden) affects METH-induced neurotoxicity. Exposure of drug-naive rats to METH (9 mg/kg, s.c.) at 4, 21, or 34 °C for 3 h resulted in breakdown of the blood-brain barrier (BBB), brain edema, and neuronal injuries, which all differed in severity depending upon ambient temperatures. The changes were moderate at 21 °C, 120-180 % larger at 34 °C, and almost absent at 4 °C. In rats chronically treated with NPs (SiO2, Cu, or Ag; 50-60 nm, 50 mg/kg, i.p. for 7 days), METH-induced brain alterations showed a two- to fourfold increase at 21 °C, a four- to sixfold increase at 34 °C, and three- to fourfold increase at 4 °C. SiO2 exposure showed the most pronounced METH-induced brain pathology at all temperatures followed by Ag and Cu NPs. Pretreatment with a potent antioxidant compound H-290/51 (50 mg/kg, p.o., 30 min before METH) significantly reduced brain pathology in naive animals exposed to METH at 21 and 34 °C. In NPs-treated animals, however, attenuation of METH-induced brain pathology occurred only after repeated exposure of H-290/51 (-30 min, 0 min, and +30 min). These observations are the first to show that NPs exacerbate METH-induced brain pathology in both cold and hot environments and demonstrate that timely intervention with antioxidant H-290/51 could have neuroprotective effects.

Contingency Management Reduces Symptoms of Psychological and Emotional Distress among Homeless, Substance-dependent Men Who Have Sex with Men

BACKGROUND

This prospective analysis evaluated the efficacy of a contingency management (CM) intervention to improve the psychological health of non-treatment seeking, homeless, substance-dependent, men who have sex with men in Los Angeles. It was hypothesized that administration of CM would be associated with reductions in participants' symptoms of psychological and emotional distress.

METHODS

One hundred and thirty-one participants were randomized into either a voucher-based contingency management (CM; n = 64) condition reinforcing substance abstinence and prosocial/health-promoting behaviors, or to a control condition (n = 67). Participants' symptoms of psychological and emotional distress were assessed at intake and at 12-months post-randomization.

RESULTS

Participants randomized into the CM intervention exhibited significantly lower levels of psychological distress in all measured symptom domains up to one year post randomization, reductions not evidenced in the control arm. Omnibus tests resultant from seemingly unrelated regression analysis confirmed that CM was significantly associated with reductions in symptoms of psychological and emotional distress, even when controlling for biomarker-confirmed substance use outcomes (χ²₍₉₎ = 17.26; p < 0.05).

CONCLUSIONS

Findings demonstrate that a CM intervention reduced symptoms of psychological and emotional distress among a sample of non-treatment seeking, homeless, substance-dependent men who have sex with men.