Abstract

This study is a meta-analysis on the effectiveness of Cognitive-Behavioral Treatment (CBT) within post-intervention pro grams for adolescent victims of school bullying in the Republic of Korea (Korea). Fourteen dissertations and journals, pub lished in Korea between 2000 and 2021, were selected based on the PICOS standards, and effect sizes were calculated using Comprehensive Meta-Analysis (CMA) Version 3. The results indicated an overall effect size of 1.00, suggesting substantial ef fects. CBT for adolescent victims demonstrated large effect sizes on self-concept, self-esteem, peer relationship, and school adjustment outcomes, while its effects on emotion outcomes, showed median effect size. Finally, this study investigated opti mal CBT conditions for better effects, indicating that CBT was most effective when conducted with five to nine participants in 10 to 14 sessions, lasting 60 minutes, twice a week. Notably, smaller group sizes, more sessions, shorter session times, and frequent interventions seemed to enhance the efficacy of CBT programs. This implies that the intensity and frequency of in terventions are pivotal in maximizing the impact of CBT for bullied adolescents. Overall, post-intervention programs em ploying CBT demonstrated mostly substantial effect sizes, providing valuable insights for future CBT implementations by identifying program components for enhanced effectiveness.