Each year a very big amount of population die because of addiction. Regarding the great population of teenagers, many of these dead persons are teenagers. In this study, the researcher made an attempt to study the relation between 2 variables of sport and self-efficiency and tendency towards addiction in teenagers. Method: this study which is itself a part of a greater one, is a semi-empirical research with 2 groups, 310 students of 9th of first period of high school in Ahwaz in 2015)Data collection was carried out by questionnaires; a researcher-made questionnaire in 3 parts (personal and familial questions, questions concerning to Pender’s health promotion model and sport questions) which has been used after determining its justifiability and stability. All the interventional sessions were 7 which were held in 40 days. At the end of these sessions, there held sport and recreational matches in 2 months. Then as posttest, questionnaires were given to students for second time. Findings: according to results obtained in this study, before interventions tendencies toward addiction were in a high level but after applying interventions, they were meaningfully decreased (P<0.05) as far as relationship between self-efficiency and sport level of students were concerned, it was determined that before interventions these variables were in a low level but after theses interventions, they were meaningfully high(P≤0.05). Conclusion: results of this study demonstrated that the rate of tendency toward addiction decreased after interventions and the difference was statistically meaningful (P≤0.05). Also the self-efficiency and sport increased after intervention, and again this difference was meaningful(P≤0.05). By these results one can understand that perceived self-efficiency and sport influence each other and both have a great impact on teenagers’ tendency toward addiction. According to the carried out intervention, it is quite clear that one can influence teenagers’ behavior related to addiction tendency and perceived self-efficiency of them directly, through not very much investment whether by time or economically. By this we can indirectly make a positive impact on teenagers’ behavior concerning addiction by increasing perceived selfefficiency of them.
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