Maryam Barati Sedeh - Department of Psychology, Nain Branch, Islamic Azad University, Nain, Iran.
Laya Molalo - ۲. Department of Psychology, Faculty of Education Sciences, Karaj Branch, Islamic Azad University, Karaj, Iran.
Fereshte Korang Beheshti - Department of Clinical Psychology, Family Therapy, Islamic Azad University, Isfahan, Iran
Roya Jafarzadeh Khademlou - Department of Psychology, Arak Branch, Islamic Azad University, Arak, Iran
Ashraf Rayati Rad - Department of Psychology, Faculty of Education Sciences Central Tehran Branch, Islamic Azad University, Tehran, Iran.

Background: The prevalence of non-suicidal self-injury has increased in adolescents. This study aimed to assess the effectiveness of family therapy compared with treatment as usual in improving character strengths and reducing self-harm repetition in adolescents.Methods: The research was designed as semi-experimental with a pre-test, post-test, and control group. The statistical population was all students of Tehran's middle schools with self-injury from October to September ۲۰۲۲. ۵۳ eligible adolescents were selected purposefully. The participants were randomly divided into two groups: a family therapy counseling (n=۲۷ people) and a control group (n=۲۶ people). The experimental group received sixteen ۷۵-min counseling sessions held weekly, while the control group underwent no interventions. Both groups received post-test evaluations following these sessions. Then, the Deliberate Self-Harm Inventory and Values in Action Inventory of Strengths scale (VIA-Youth) pre- and post-intervention were implemented. SPSS ۲۴ used a multivariate analysis of the covariance (MANCOVA) version.Results: The effect of family therapy on the self-injury variable was significant (F=۳۲.۶۱; Pvalue<۰.۰۰۱). Also, the effect of family therapy on character strengths (F=۲۴.۸۱; Pvalue<۰.۰۰۱) was confirmed. In addition, it related the largest effect size to the self-injury variable (۰.۶۴۸), which shows that ۶۴% of the total variances of the experimental and control groups result from a family therapy approach.Conclusions: The results showed that family therapy could effectively improve character strengths and reduce self-injurious behaviors in adolescents aged ۱۳-۱۶.Keywords: Family therapy, Adolescent, Self-harm, Character strengths.Background: The prevalence of non-suicidal self-injury has increased in adolescents. This study aimed to assess the effectiveness of family therapy compared with treatment as usual in improving character strengths and reducing self-harm repetition in adolescents. Methods: The research was designed as semi-experimental with a pre-test, post-test, and control group. The statistical population was all students of Tehran's middle schools with self-injury from October to September ۲۰۲۲. ۵۳ eligible adolescents were selected purposefully. The participants were randomly divided into two groups: a family therapy counseling (n=۲۷ people) and a control group (n=۲۶ people). The experimental group received sixteen ۷۵-min counseling sessions held weekly, while the control group underwent no interventions. Both groups received post-test evaluations following these sessions. Then, the Deliberate Self-Harm Inventory and Values in Action Inventory of Strengths scale (VIA-Youth) pre- and post-intervention were implemented. SPSS ۲۴ used a multivariate analysis of the covariance (MANCOVA) version. Results: The effect of family therapy on the self-injury variable was significant (F=۳۲.۶۱; Pvalue<۰.۰۰۱). Also, the effect of family therapy on character strengths (F=۲۴.۸۱; Pvalue<۰.۰۰۱) was confirmed. In addition, it related the largest effect size to the self-injury variable (۰.۶۴۸), which shows that ۶۴% of the total variances of the experimental and control groups result from a family therapy approach. Conclusions: The results showed that family therapy could effectively improve character strengths and reduce self-injurious behaviors in adolescents aged ۱۳-۱۶. Keywords: Family therapy, Adolescent, Self-harm, Character strengths.

Family therapy, Adolescent, Self-Harm, Character Strengths