The study examined the effectiveness of Functional Family Therapy (FFT), as compared to probation services, in a community juvenile justice setting 12 months post treatment. The study also provides specific insight into the interactive effects of therapist model specific adherence and measures of youth risk and protective factors on behavioral outcomes for a diverse group of adolescents. The findings suggest that FFT was effective in reducing youth behavioral problems, although only when the therapists adhered to the treatment model. High adherent therapists delivering FFT had a statistically significant reduction of (35%) in felony, a (30%) violent crime, and a marginally significant reduction (21%) in misdemeanor recidivisms as compared to the control condition. The results represent a significant reduction in serious crimes one year after treatment, when delivered by a model adherent therapist. The low adherent therapists were significantly higher than the control group in recidivism rates. There was an interaction effect between youth risk level and therapist adherence demonstrating that the most difficult families (those with high peer and family risk) had a higher likelihood of successful outcomes when their therapist demonstrated model specific adherence. These results are discussed within the context of the need and importance of measuring and accounting for model specific adherence in the evaluation of community-based replications of evidence-based family therapy models like FFT.Adolescents involved in the justice system are clinically complex, with particularly high rates of behavior problems, mental health disorders, and other "at risk" behaviors. Estimates are that 50% to 80% of delinquent adolescents meet the criteria for a mental disorder, such as conduct or substance-related disorders (Kazdin & Weisz, 2003). Considering the family's important role in the initiation and escalation of adolescent problem behaviors, family-based interventions have been of great interest to treatment researchers and community practitioners (Rowe & Liddle, 2003). Numerous reviews have identified Functional Family Therapy (FFT) as one of the emerging evidence-based intervention programs for at-risk adolescent youth and their families (Elliott, 1997;Alexander & Sexton, 2002;Sexton, et al., 2003;Waldron & Turner, 2008). FFT has an established record of outcome studies that demonstrate its efficacy with a wide variety of adolescent related problems including youth violence, drug abuse, and other delinquency related behaviors. The positive outcomes of Address Correspondence to: Thomas Sexton, Ph. D., Center for Adolescent and Family Studies, Indiana University, 1901 East 10 th Street, Bloomington, IN, 812-856-1485 (phone), 812-856-2084, thsexton@indiana.edu. FFT remain relatively stable even after a five-year follow-up (Gordon, Arbuthnot, Gustafson, & McGreen, 1988), and the positive impact also affects siblings of the identified adolescent (Klein, Alexander, & Parsons, 1977).
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