Meta-analysis of Findings on the Effectiveness of Cognitive-Behavioral Therapies on Reducing Students' Psychological Problems

This research is aimed at a meta-analysis of research on the effectiveness of cognitive-behavioral therapies in reducing students' psychological problems. The statistical population is research that has relatively similar questions about the effectiveness of cognitive-behavioral therapies and their method is either experimental or quasi-experimental. By reviewing the history, 28 articles were found. All of these articles were from 2011 to 2015. Of these, only 16 reported well-reported statistical results. The mean test p was selected for combining the test results and the Cohen effect size method was used to achieve the total effect value. The findings of the study indicated that the average size of d in the effectiveness of cognitive-behavioral therapies in reducing students' psychological problems was 1.067. By converting the average d to z values in a normal distribution curve, the normal curve cover level was 0.86, which is relatively high. The significance level of the calculations was also 0.01 and the overall effectiveness of cognitive-behavioral therapies was confirmed in reducing students' psychological problems.