Long-term effects of prevention and treatment on youth antisocial behavior: A meta-analysis.

Youth antisocial behavior exacts a tremendous toll on society and often persists into adulthood. Although researchers have identified a number of psychosocial interventions that prevent or reduce youth antisocial behavior in the short term, evidence of long-term intervention benefits has only recently become available. In addition, research on such interventions spans two substantial but largely separate bodies of literature: prevention and therapy. The present study used meta-analysis to integrate research on the long-term effects of preventive and therapeutic interventions for youth antisocial behavior and examined potential moderators of these effects. Results from 66 intervention trials (i.e., 34 prevention, 32 therapy) indicated that a broad range of youth psychosocial interventions demonstrated modest effects on antisocial behavior (mean d=0.31, 95% confidence interval=0.23-0.39) for at least one year beyond the end of interventions relative to control conditions. Among other findings, moderator analyses revealed that inclusion of a peer group intervention component was associated with reduced intervention effects for samples consisting predominantly of boys or older youths. The results of this study have important implications for service providers, administrators, and policymakers involved in the implementation of preventive and therapeutic interventions targeting youth antisocial behavior.

The economic impact of multisystemic therapy through midlife: a cost-benefit analysis with serious juvenile offenders and their siblings.

OBJECTIVE: This study investigated the economic benefits of multisystemic therapy (MST) versus individual therapy (IT) using arrest data from 176 serious juvenile offenders and 129 of their closest-in-age siblings who participated, on average, 25 years earlier in a randomized clinical trial (Borduin et al., 1995). METHOD: Two types of benefits of MST were evaluated: (a) The value to taxpayers was derived from measures of criminal justice system expenses (e.g., police and sheriffs' offices, court processing, community supervision), and (b) the value to crime victims was derived from measures of both tangible (e.g., property damage and loss, health care, lost productivity) and intangible (e.g., pain, suffering, reduced quality of life) losses. RESULTS: Reductions in criminality in the MST versus IT conditions were associated with lasting benefits to both taxpayers and crime victims, with cumulative benefits of MST estimated at $35,582 per juvenile offender and $7,798 per sibling. Overall, every dollar spent on MST recovered $5.04 in savings to taxpayers and crime victims in the 25 years following treatment. CONCLUSIONS: This study represents the most comprehensive cost-benefit analysis of an MST clinical trial to date and demonstrates that an evidence-based treatment such as MST can produce modest economic benefits well into adulthood. Implications of the authors' findings for policymakers and public service agencies are discussed.

Long-term prevention of criminality in siblings of serious and violent juvenile offenders: a 25-year follow-up to a randomized clinical trial of multisystemic therapy.

OBJECTIVE: Family-based treatment models that have shown effectiveness with juvenile offenders may also lead to reduced criminality in siblings of those offenders. However, the lasting effects of such treatments on siblings have not been evaluated. In the present study, the authors examined criminal outcomes for siblings of serious and violent juvenile offenders who had participated on average 25.0 years earlier in a clinical trial of multisystemic therapy (MST; Borduin et al., 1995). METHOD: Participants were 129 closest-in-age siblings of individuals who were originally randomized to MST or individual therapy (IT) during adolescence. Arrest and incarceration data were obtained in middle adulthood when siblings were on average 38.4 years old. RESULTS: Intent-to-treat analyses showed that arrest rates were significantly lower for siblings in the MST condition than in the IT condition (43.3% vs. 72.0%, respectively). In addition, siblings in the IT condition were about 3 times as likely to be convicted of a felony and more than twice as likely to be sentenced to incarceration and probation. CONCLUSION: The present study represents the longest follow-up to date of sibling participants in an MST clinical trial and demonstrates that the positive impact of an evidence-based treatment for serious and violent juvenile offenders can extend to other family members. Implications of the authors' findings for policymakers and service providers are discussed.

Effects of multisystemic therapy through midlife: a 21.9-year follow-up to a randomized clinical trial with serious and violent juvenile offenders.

OBJECTIVE: Although current evidence suggests that the positive effects of multisystemic therapy (MST) on serious crime reach as far as young adulthood, the longer term impact of MST on criminal and noncriminal outcomes in midlife has not been evaluated. In the present study, the authors examined a broad range of criminal and civil court outcomes for serious and violent juvenile offenders who participated on average 21.9 (range = 18.3-23.8) years earlier in a clinical trial of MST (C. M. Borduin et al., 1995). METHOD: Participants were 176 individuals who were originally randomized to MST or individual therapy (IT) during adolescence and averaged 3.9 arrests for felonies prior to treatment. Arrest, incarceration, and civil suit data were obtained in middle adulthood when participants were on average 37.3 years old. RESULTS: Intent-to-treat analyses showed that felony recidivism rates were significantly lower for MST participants than for IT participants (34.8% vs. 54.8%, respectively) and that the frequency of misdemeanor offending was 5.0 times lower for MST participants. In addition, the odds of involvement in family-related civil suits during adulthood were twice as high for IT participants as for MST participants. CONCLUSIONS: The present study represents the longest follow-up to date of an MST clinical trial and demonstrates that the positive impact of an evidence-based youth treatment such as MST can last well into adulthood. Implications of the authors' findings for policymakers and service providers are discussed.