The internet use and internet addiction is increasingly considerable among the students and university students. The current study aimed to determine the factors of internet addiction based on the planned behavior theory among boy students of the dormitories of Tehran University of Medical Sciences in 2012. In the descriptive-analytical study that was carried out by cluster sampling on 150 boy students of the dormitories of Tehran University of Medical Sciences. The data collection instrument were Young's internet addiction scale questionnaire and a manuscript questionnaire which its reliability and validity were obtained. Manuscript questionnaire was including background questions and the questions of planned behavior theory structures. The data were analyzed by SPSS software (version 16) by Chi-square test and Correlation Coefficient test.The mean of internet addiction (49.48 with standard deviation 14.56) was obtained. 86.66% of the students had internet addiction behavior (mild, moderate and severe). There was a significant relationship between attitudes and internet addiction scores (p<0.008). There was a significant relationship between perceived behavioral control and internet addiction scores (p<0.004).The planned behavior theory due to having behavioral intention, attitude, subjective norms and perceived behavioral control is a proper model to investigate internet addiction.

Keywords: The theory of planned behavior, internet addiction, students

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