The widespread interest in using motivational approaches in the eating disorders is not strongly supported by the literature. The current evidence base does not support the widespread dissemination of motivation-enhancing interventions in the eating disorders.

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Background The Systemic Therapy for At Risk Teens (START) trial is a randomised controlled trial of multisystemic therapy (MST) compared with management as usual (MAU). The present study reports on long-term follow-up of the trial (to 60 months). Objectives The primary objective was to compare MST and MAU for the proportion of young people in each group with criminal convictions up to 60 months post baseline. Secondary outcomes included group comparisons of psychological and behavioural factors. An economic analysis was carried out to determine the cost-effectiveness of MST compared with MAU. Two qualitative studies were conducted to better understand the subjective experiences of the participants. Design Primary outcomes (collected up to 60 months) were collected using a centralised police database. Secondary outcomes were evaluated using self-report questionnaires completed by both young people and parents or carers at the 24-, 36- and 48-month follow-ups. Research assistants were blind to treatment allocation. Setting Participants were recruited from participating MST sites in nine areas of England. Secondary outcomes were typically collected within the family home. Participants A total of 684 families were recruited into the START trial and allocated randomly to a treatment group. Of these, 487 remained in the second phase of the trial. Young people were aged, on average, 13.8 years at baseline, with 63% male and 37% female. Interventions MST is a manualised programme for young people exhibiting antisocial behaviour and their families that uses principles from cognitive–behavioural and family therapy to provide an individualised approach. MAU content was not prespecified, but consisted of the standard care offered to young people who met eligibility for the trial. Main outcome measures Young people’s offending was evaluated using the Police National Computer. Secondary measures included validated self-report measures completed by both the young person and their parent or carer. The economic evaluation took a broad perspective and outcomes were assessed in terms of quality-adjusted life-years and offending. Results No significant differences were found in the proportion of offending between the groups (hazard ratio 1.03, 95% confidence interval 0.84 to 1.26; p = 0.78). No differences were found between the groups on secondary outcome measures, with a few exceptions that did not hold up consistently across the follow-up period. The economic analysis did not find evidence to support the cost-effectiveness of MST compared with MAU. Outcomes from the qualitative studies suggest that families mostly felt positive about MST, and that MST was associated with greater maturity in young men. Limitations Some intended evaluations were not possible to deliver. Selective attrition may have influenced the nature of the sample size. It is also unclear how representative the MAU services were of reality. Future research Recommendations are made for the evaluation of MST in populations with more severe behavioural problems, as well as for identifying and testing new moderators. Conclusions The results of the second phase of the START trial do not support the long-term superiority of MST to MAU, but elements of the intervention may be adapted successfully. Trial registration Current Controlled Trials ISRCTN77132214 and London South-East REC registration number 09/H1102/55. Funding This project was funded by the National Institute for Health Research (NIHR) Health Services and Delivery Research programme and will be published in full in Health Services and Delivery Research; Vol. 8, No. 23. See the NIHR Journals Library website for further project information.

The peer influence and peer selection effects are two widely replicated findings in the criminological literature that refer to the predictive relationship between antisocial behaviour and delinquent peer association as well as between delinquent peer association and antisocial behaviour, respectively. Research suggests that antisocial cognition might constitute a causal mechanism underlying part of these effects. This study investigated the extent that the peer influence and peer selection effects are mediated by one key aspect of antisocial cognition—beliefs and attitudes supporting peer conflict. This study examined whether beliefs and attitudes supporting peer conflict mediated the relationship between delinquent peer association and volume of self-reported antisocial behaviour and vice-versa, across a 1-year follow-up period, in 683 (433 male, 250 female) British adolescents (mean age: 13.8 years) with a history of serious antisocial behaviour. Participants completed measures at baseline and 6, 12 and 18 months thereafter. Findings indicated that beliefs and attitudes supporting peer conflict partially mediated the peer influence and peer selection effects, explaining a substantial proportion of the total effect in the peer influence (i.e., 26%) and peer selection (i.e., 17%) models. These results suggest that beliefs and attitudes supporting peer conflict could explain part of the mechanism underlying the peer influence and peer selection effects in adolescents with a history of serious antisocial behaviour.

This qualitative study examines the possible long-term impact of multisystemic therapy (MST) as young people experience the transition from adolescence to young adulthood. MST is an intensive intervention aimed at reducing antisocial behavior among young people. Interviews were conducted with 32 young people aged 16 to 22 years at their 48-month follow-up as part of the Systemic Therapy for At-Risk Teens (START) evaluation trial in the United Kingdom. Sixteen participants had received MST while 16 received management as usual (MAU). Interviews addressed participants’ current life experiences and were analyzed with interpretative phenomenological analysis (IPA). The inductive qualitative analysis data were transformed into numerical data. Interview extracts were coded as either forward-looking and hopeful (“mature”) or static and frustrated (“stuck”). Among males, significantly more mature outcomes were found among participants who had received MST compared with MAU. No differences were seen between the female groups. A detailed qualitative commentary shows how the constructs, mature and stuck, are manifest across the four domains. The findings suggest that working with an MST therapist during adolescence helped young men cultivate more mature, forward-looking viewpoints and life activities 4 years later when transitioning into adulthood. Findings are discussed in relation to relevant theory and practical applications.