Pilot outcome results of culturally adapted evidence-based substance use disorder treatment with a Southwest Tribe

• A pilot study of evidence-based treatment outcomes with American Indians with 8-month follow-ups
• Medium to large effect sizes for increased percent days abstinent at 4- and 8-month follow-ups
• Medium to large effect sizes for improvements in psychological distress and 5 of 7 ASI domains.
• Small effect size for improvement in self-efficacy

IntroductionAlthough American Indians/Alaska Natives (AI/ANs) have exhibited high rates of alcohol and drug use disorders, there is a paucity of substance use disorder treatment outcome research. In addition, there exists controversy about whether evidence-based treatments (EBTs) are culturally appropriate given that they were derived mainly by and for non-Hispanic White populations and do not explicitly include aspects of AI/AN culture and worldview.MethodsIn this pilot study, we collaboratively culturally adapted two EBTs, Motivational Interviewing and Community Reinforcement Approach (MICRA), and evaluated substance use and psychological outcomes at 4- and 8-months post-baseline assessment. In preparation for a larger randomized clinical trial (RCT), eight tribal members (75% male) participated in this pilot treatment study. Measures included substance use, urine screens, self-efficacy, psychological distress, and hopelessness. All participants completed follow-up assessments at 4- and 8-months. Due to small sample size, effect sizes were calculated to evaluate outcomes pre- and post-treatment.ResultsDespite high rates of abstinence at baseline, percent days abstinent (PDA) increased at the 8-month time point for the most commonly used substances (alcohol, Hedges's g = 0.59, and marijuana, g = 0.60) and for all substances combined (excluding tobacco, g = 0.56). Improvements in psychological distress (g = − 0.66) and 5 of the 7 Addiction Severity Index domains (range of g = − 0.42 to − 0.98) also emerged.ConclusionsResults suggest that culturally adapted EBTs yield significant improvements in alcohol use, psychological distress, and legal problems among AI/ANs. Future research using RCT methodology is needed to examine efficacy and effectiveness.