fa شیوع پرخاشگری و برخی عوامل مرتبط با آن در دانش‌آموزان مدارس راهنمایی شهر بیرجند (سال 89-1388) General پژوهشي Research Article <div style="text-align: justify;"><span style="font-size:14px;"><span style="font-family:Times New Roman;"><strong>Background and Aim: </strong>Adolescence is one of the most important life longperiods and adolescents are among the most vulnerable social groups. The emergence of strong emotions following physical, psychological, and cognitive changes in them can lead to aggression. The present study aimed at exploring the relationship between aggression and related issues in secondary school students in Birjand.<br> <strong>Materials and Methods: </strong>This study was a descriptive-analytical one done on 750 secondary school students in Birjand in 2009, who were selected through classified randomized sampling. For data collection a demographic questionnaire and Buss and Perry&rsquo;s aggression questionnaire were used. The obtained data was analyzed by means of SPSS software using descriptive and analytic statistics including independent t test and ANOVA.<br> <strong>Results</strong>: 54.1% of males and 52.8% of females were aggressive. There was a significant relationship between mean aggression and sex (P=0.007). But, no significant difference was observed between aggression of the students and other variables considered in this study such as father&rsquo;s and mother&rsquo;s occupation, father&rsquo;s and mother&rsquo;s education, student average in the previous term, and one&#39;s birth order. There was a significant relationship between the length of time spent working with computer and watching television, and aggression (P<0.001). There was also a significant relationship between aggression and girls&#39; menstrual cycle (P<0.001).<br> <strong>Conclusion</strong>: It was found that aggression was higher in students who spent more time watching television. The results should be considered in psychological health planning.</span></span></div> Aggression,Addictive Behavior,Students,Birjand 355 363 http://mcj.bums.ac.ir/browse.php?a_code=A-10-1-552&slc_lang=fa&sid=1 Marzieh Torshizi مرضیه ترشیزی Yes Instructor, Faculty of Nursing and Midwifery, Birjand University of Medical Sciences, Birjand, Iran عضو هیات علمی دانشکده پرستاری و مامایی، دانشگاه علوم پزشکی بیرجند، ایران. تلفن:05618825342 پست الکترونیک:m3torshizi@bums.ac.ir Alireza Saadatjoo سید علیرضا سعادتجو No Instructor, Faculty of Nursing & Midwifery, Birjand University of Medical Science, Birjand, Iran عضو هیات علمی دانشکده پرستاری و مامایی و عضو مرکز تحقیقات دیابت دانشگاه علوم پزشکی بیرجند، ایران