This is the first meta-meta-analysis examining the effects of parent-based interventions for children with externalizing behavior problems on parental characteristics (parenting, parental perceptions, parental mental health, parental relationship quality). Parent training interventions are recognized as evidence-based interventions for the treatment of externalizing behavior problems, although meta-analytic effects are heterogeneous. The objective of the present study was to comprehensively combine meta-analytic results on parent training interventions to arrive at valid effect predictions. Electronic databases were searched (PsycINFO, Medline, PubMed). In total, 11 meta-analyses were included that mainly comprised parents of children under the age of 13 years. Analyses were based on random effects models. Effect estimates were transformed to standardized mean differences (SMD) and corrected for primary study overlap. Results revealed a significant moderate overall effect for parenting (SMD 0.53) as well as for parents' report of parenting (SMD 0.60) and parental perceptions (SMD 0.52). Effects remained stable to follow-up. Results for observational data, parental mental health and parental relationship quality were small and only partially significant. Considerable heterogeneity within results was revealed. Overall, parent training interventions proved to be effective in improving parental characteristics for parents of children with externalizing behavior problems. Effectiveness was stronger regarding characteristics explicitly targeted by interventions. The findings should encourage health-care providers to apply evidence-based parent training interventions.
Keywords: Externalizing behavior problems; Meta–meta-analysis; Parent training effectiveness; Parents.