There are several meta-analyses of treatment effects for children and adolescents with attention deficit hyperactivity disorder (ADHD). The conclusions of these meta-analyses vary considerably. Our aim was to synthesize the latest evidence of the effectiveness of psychological, pharmacological treatment options and their combination in a systematic overview and meta-meta-analyses. A systematic literature search until July 2022 to identify meta-analyses investigating effects of treatments for children and adolescents with ADHD and ADHD symptom severity as primary outcome (parent and teacher rated) yielded 16 meta-analyses for quantitative analyses. Meta-meta-analyses of pre-post data showed significant effects for pharmacological treatment options for parent (SMD = 0.67, 95% CI 0.60 to 0.74) and teacher ADHD symptom ratings (SMD = 0.68, 95% CI 0.54 to 0.82) as well as for psychological interventions for parent (SMD = 0.42, 95% CI 0.33 to 0.51) and teacher rated symptoms (SMD = 0.25, 95% CI 0.12 to 0.38). We were unable to calculate effect sizes for combined treatments due to the lack of meta-analyses. Our analyses revealed that there is a lack of research on combined treatments and for therapy options for adolescents. Finally, future research efforts should adhere to scientific standards as this allows comparison of effects across meta-analyses. Copyright © 2023. Published by Elsevier Ltd.
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