![]() ![]() However, there is also a second strongly expanding field of developmental and life course criminology that has applied findings on risk and protective factors in order to prevent undesirable trajectories. These designs have substantially increased our knowledge on the onset, continuity, and aggravation of as well as the desistance from criminal behavior along with our understanding of risk and protective factors and potential causal mechanisms. ![]() Many of the advances in developmental and life course criminology that led to the foundation of this journal have come from prospective longitudinal research. Mean results are promising, but more long-term evaluations, replications, booster approaches, and combinations with other types of interventions are necessary to ensure a substantial impact on antisocial development in the life course. Evaluations performed since our previous meta-analysis in 2003 did not reveal larger effects, but training format, intensity, and other moderators were relevant. There was much heterogeneity in the findings. Indicated prevention for youngsters who already showed some antisocial behavior had better effects than universal approaches and (partially related to this) older youngsters benefited more than preschool children. In the latter studies, mean effects were no longer significant. Only a minority ( k = 14) had follow-up assessments after more than 1 year. Most outcome measurements were assessed within 3 months or up to 1 year after training. There were similar effects on aggression, delinquency, and other outcomes, but a tendency to somewhat stronger effects in behavior observations and official records than in rating scales. Overall, the mean effect was positive, but rather small ( d = 0.25 using the random effect model). Most interventions were based on a cognitive-behavioral approach. Overall, 31,114 children and youths were included in these evaluations. From a systematic search of 1133 reports, we found 113 studies with 130 eligible RCT comparisons between a program and control group. We updated a meta-analysis on this topic Lösel & Beelman (Annals of the American Academy of Political and Social Science 587:84–109, 2003) to cover more recent studies while focusing specifically on aggression, delinquency, and related antisocial outcomes. The present article contains a comprehensive meta-analysis of randomized controlled trials (RCTs) on the effects of this type of intervention. Within this context, child training on social skills plays an important role. Developmental and life course criminology (DLCC) engages not only in correlational longitudinal research but also in programs of developmental prevention. ![]()
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