Method: For this purpose, the meta-analysis method was used as a statistical method to determine, collect, combine and summarize the research results associated with these patterns.
Among all the studies conducted in Iran between 2008 and 2016, the articles that are appropriate methodologically, such as society, sample size, research method, sampling method and measurement tools, have been included studied in the present study. Finally, 15 studies with the necessary criteria have been analyzed.
Results: The results of the study showed that the overall effect size of these 15 studies under the constant model is equal to 0/361, which is high according to the Cohen criterion interpretation.
Conclusion: Regarding the high effectiveness of psychological and educational interventions, it can be concluded that the educational interventions and psychological treatments can play a major role in reducing the symptoms of oppositional defiant disorder.