en Health Profession Skills and Practice Health Profession Skills and Practice پژوهشی اصيل Original Research <span style="font-size:12pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times=""><b><span cambria="" lang="EN" style="font-family:">Aims:</span></b><span cambria="" lang="EN" style="font-family:"> Aggression in early adolescence is a critical psychological challenge that often stems from deficits in emotional processing and low distress tolerance.</span> <span cambria="" lang="EN" style="font-family:">This study aimed to evaluate the efficacy of Emotion-Focused Therapy (EFT) on aggression and distress tolerance among middle school female students exhibiting clinical symptoms of aggression.</span></span></span></span><br> <span style="font-size:12pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times=""><b><span cambria="" lang="EN" style="font-family:">Materials & Methods:</span></b> <span cambria="" style="font-family:">This study was a randomized clinical trial using a pretest-posttest control group design with a three-month follow-up period. The statistical population consisted of all female middle school students in Tehran during the 2024&ndash;2025 academic year. Through multi-stage random sampling and clinical screening, 40 eligible students were selected and randomly assigned to either the experimental group (n=20) or the control group (n=20). The experimental group received eight 90-minute sessions of EFT, while the control group remained on a waitlist. Data were collected using the Ahvaz Aggression Inventory (AAI) and the Distress Tolerance Scale (DTS). Data analysis was conducted using SPSS-26 at a significance level of &alpha;=0.05.</span><span lang="EN" style="font-family:"Cambria",serif"></span></span></span></span><br> <span style="font-size:12pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times=""><b><span cambria="" lang="EN" style="font-family:">Findings:</span></b> <span cambria="" style="font-family:">The results demonstrated that EFT significantly reduced aggression and increased distress tolerance in the experimental group compared to the control group (P<0.001). These therapeutic effects were successfully sustained during the three-month follow-up assessment.</span><span lang="EN" style="font-family:"Cambria",serif"></span></span></span></span><br> <span style="font-size:12pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times=""><b><span cambria="" lang="EN" style="font-family:">Conclusion:</span></b><span cambria="" lang="EN" style="font-family:"> EFT serves as an effective clinical intervention for middle school students, providing a structured approach to emotional regulation that leads to long-term reductions in aggressive behavior and improved psychological endurance.</span></span></span></span><br> &nbsp; ,Emotion-focused therapy,Aggression,Distress tolerance,Adolescent,Clinical trial 1001 1007 http://jccs.yums.ac.ir/browse.php?a_code=A-10-364-2&slc_lang=en&sid=1 R. Roustaei marjanghasempour1@gmail.com 10031947532846006496 10031947532846006496 No S. Bavi sassanbavi@gmail.com 10031947532846006497 10031947532846006497 Yes