The purpose of this research was to investigate the effectiveness of positive parenting group training on aggression, anxiety, and depression in preschool children. The research was also conducted semi-experimental with a research design of ۲ groups (one experimental group and one control group) with pre-test and post-test. The statistical population includes preschool children in Tabriz City who were referred to two private clinics by their parents to solve behavioral problems (aggression, anxiety, and depression), who were selected randomly from two treatment centers, ۲۰ children from each center. Before the implementation of educational programs. The two groups were tested by Beck's anxiety questionnaire (۱۹۶۷), Bass and Perry's aggression (۱۹۹۲), and Beck's depression (۱۹۶۴) tests. For the experimental group, the positive parenting training program was implemented in sessions of ۹۰ minutes, and the control group did not receive anything. Finally, by answering the aggression, anxiety, and depression questionnaires again, the parents did the post-test. These research data were analyzedd using SPSS software and in two levels of descriptive and inferential statistics with MANOVA analysis. The research findings indicate that the positive parenting group training of parents has an effect on the level of aggression, anxiety, and depression of children and also reduces aggression, anxiety, and depression in preschool children.
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