title: Predicting Aggression among Male Adolescents: an Application of the Theory of Planned Behavior.
abstract: BACKGROUND
  Aggressive behaviorin adolescencecan be expressed asa predictorfor crime, substanceabuse, depression and academic failure. The purpose of this study was to determine the prediction of aggression among Iranian adolescent based on theory of planned behavior (TPB) as a theoretical framework.
  
  
  METHODS
  In this cross-sectional study, conducted in Yasuj County, south of Iran, during 2011, a total of 256 male adolescents, were randomly enrolled. Participants filled out a self-administered questionnaire. Data were analyzed by SPSS version 21 using bivariate correlations, and linear regression statistical tests at 95% signifi-cant level.
  
  
  RESULTS
  The three predictor variables of 1) attitude, 2) subjective norms, and 3) perceived behavioral control, accounted for 40% of the variation in the outcome measure of the aggression intention. Besides, intention accounted for 15% of the variation in the outcome measure of the aggression behavior. There was a sig-nificant correlation between drug abuse and alcohol consumption, have friend drug user, unprotect sex and parents divorced with aggression (P< 0.05).
  
  
  CONCLUSIONS
  Designing intervention to reduction positive attitude and subjective norms toward aggressive behavior among adolescents could be usefulness result to aggression prevention.
authors.affiliation: Social Determinants of Health Research Center, Yasuj University of Medical Science, Yasuj, Iran.
authors.forename: Fazel
authors.initials: F
authors.lastname: Zinatmotlagh
authors.affiliation: Substance Abuse Prevention Research Center, Kermanshah University of medical sciences, Kermanshah, Iran.
authors.forename: Mari
authors.initials: M
authors.lastname: Ataee
authors.affiliation: Substance Abuse Prevention Research Center, Kermanshah University of medical sciences, Kermanshah, Iran.
authors.forename: Farzad
authors.initials: F
authors.lastname: Jalilian
authors.affiliation: Department of Health Education, Shahid Sadoughi University of Medical Sciences- Yazd, Iran.
authors.forename: Mehdi
authors.initials: M
authors.lastname: Mirzaeialavijeh
authors.affiliation: Substance Abuse Prevention Research Center, Kermanshah University of medical sciences, Kermanshah, Iran.
authors.forename: Abbas
authors.initials: A
authors.lastname: Aghaei
authors.affiliation: Department of Public Health, Yasuj University of Medical Sciences, Yasuj, Iran.
authors.forename: Kambiz
authors.initials: K
authors.lastname: Karimzadeh Shirazi
keywords: Adolescent; Aggression; Attitude; Subjective Norms