Alcohol demand moderates brief motivational intervention outcomes in underage young adult drinkers |
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| Affiliation: | 1. Center for Alcohol & Addiction Studies, Brown University, United States;2. Peter Boris Centre for Addictions Research, McMaster University & St. Joseph''s Healthcare Hamilton, United States;3. Department of Psychology, University of Memphis, United States;1. Department of Psychiatry, University of Vermont, Burlington, VT 05401, USA;2. Department of Medical Biostatistics, University of Vermont, Burlington, VT 05401, USA;1. San Diego State University, Department of Psychology, San Diego, CA, USA;2. Cincinnati Children''s Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, OH, USA;3. San Diego State University Research Foundation, San Diego, CA, USA;4. San Diego State University, School of Public Health, San Diego, CA, USA;5. Veterans Administration San Diego Healthcare System and Department of Psychiatry, University of California, San Diego, CA, USA;1. Primary Care Unit, Faculty of medicine, University of Geneva, Geneva, Switzerland;2. Centre de recherche en Epidémiologie et Santé des Populations (CESP), INSERM, U1178 Villejuif, France;3. Unité Santé Jeunes, Department of Primary Care and Department of Gynecology and Pediatrics, Geneva University Hospitals, Geneva, Switzerland;1. University of Houston, United States;2. Duquesne University, United States;3. University of Washington, United States;1. Institute for Translational Research in Children''s Mental Health, Institute of Child Development, University of Minnesota, USA;2. Institute for Social Research, University of Michigan, USA;3. Center for the Study of Health Risk Behaviors, Department of Psychiatry and Behavioral Sciences, University of Washington, USA;4. Department of Psychology, University of Michigan, USA |
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| Abstract: | IntroductionThe Alcohol Purchase Task (APT), a behavioral economic measure of alcohol's reinforcing value (demand), has been used to predict the effects of Brief Motivational Intervention (BMI) on alcohol use outcomes. However, it is not known whether BMI may be more or less efficacious, relative to control, among those with different levels of alcohol demand prior to treatment.MethodsNon college-attending young adults (N = 150) reporting past-month heavy drinking were randomized to a single in-person session of BMI or a relaxation training control (REL). The BMI included delivery of personalized feedback and focused on developing discrepancy between the young adults' goals and their current pattern of alcohol use. At baseline, participants completed assessments of alcohol use and the APT. Drinking levels were re-assessed at 6 weeks and 3 months post-intervention. Demand indices derived from the APT were examined as moderators of treatment effects on follow-up drinking after covarying for baseline alcohol use.ResultsTwo of four APT demand indices – intensity and Omax - moderated treatment outcomes. Relative to REL, BMI led to greater reductions in total number of drinks consumed and drinks per drinking day among participants with higher baseline alcohol demand. This association was not observed among participants with lower levels of alcohol demand.ConclusionsThese results demonstrate that BMI may be particularly beneficial for those with a high reinforcing value of alcohol. The mechanism for this effect is unclear, and determining the process by which BMI confers increased benefit for these individuals is a fruitful area for future work. |
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