title: Relationship between violent behavior and repeated weight-loss dieting among female adolescents in Japan.
abstract: OBJECTIVE
  To examine whether interpersonal violence perpetration and violence toward objects are associated with body mass index (BMI), body weight perception (BWP), and repeated weight-loss dieting in female adolescents.
  
  
  METHODS
  A cross-sectional survey using a self-report questionnaire was performed evaluating interpersonal violence perpetration, violence toward objects, the number of diets, BMI, BWP, the 12-item General Health Questionnaire (GHQ-12), victimization, substance use, and other psychosocial variables among 9,112 Japanese females aged between 12-18 years. Logistic regression analysis was conducted to analyze the contribution of BMI, BWP, and weight-control behavior to the incidence of violent behavior, while controlling for potential confounding factors.
  
  
  RESULTS
  The number of diets was associated with both interpersonal violence perpetration (OR = 1.18, 95% CI 1.08-1.29, p<0.001) and violence toward objects (OR = 1.34, 95% CI 1.24-1.45, p<0.001), after adjusting for age, BMI, BWP, the GHQ-12 total score, victimization, and substance use. In terms of BMI and BWP, the "overweight" BWP was associated with violence toward objects (OR = 1.29, 95% CI 1.07-1.54, p<0.05). On the other hand, the "Underweight" and "Slightly underweight" BMI were related to violence toward objects [(OR = 1.28, 95% CI 1.01-1.62, p<0.05) and (OR = 1.27, 95% CI 1.07-1.51, p<0.05), respectively]. The "Underweight" BWP was related to interpersonal violence perpetration (OR = 2.30, 95% CI 1.38-3.84, p<0.05).
  
  
  CONCLUSIONS
  The cumulative number of diets is associated with violent behavior in female adolescents. In addition, underweight BMI and extreme BWP are associated with violent behavior.
authors.affiliation: Department of Psychiatry and Cognitive-Behavioral Medicine, Nagoya City University Graduate School of Medical Sciences, Mizuho-cho, Mizuho-ku, Nagoya, Japan.
authors.forename: Nao
authors.initials: N
authors.lastname: Shiraishi
authors.affiliation: Department of Psychiatry and Behavioral Science, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Nishida
authors.affiliation: Department of Neuropsychiatry, Kochi Medical School, Kochi University, Nanngoku, Kohchi, Japan.
authors.forename: Shinji
authors.initials: S
authors.lastname: Shimodera
authors.affiliation: Laboratory of Health Education, Graduate School of Education, the University of Tokyo, Bunkyo, Tokyo, Japan.
authors.forename: Tsukasa
authors.initials: T
authors.lastname: Sasaki
authors.affiliation: Office for Mental Health Support, Division for Counseling and Support, The University of Tokyo, Bunkyo, Tokyo, Japan.
authors.forename: Norihito
authors.initials: N
authors.lastname: Oshima
authors.affiliation: Department of Clinical Epidemiology, Translational Medical Center, National Center of Neurology & Psychiatry, Kodaira, Tokyo, Japan.
authors.forename: Norio
authors.initials: N
authors.lastname: Watanabe
authors.affiliation: Department of Psychiatry and Cognitive-Behavioral Medicine, Nagoya City University Graduate School of Medical Sciences, Mizuho-cho, Mizuho-ku, Nagoya, Japan.
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Akechi
authors.affiliation: Department of Health Promotion and Human Behavior, Kyoto University Graduate School of Medicine/School of Public Health, Yoshida Konoe-cho, Sakyo-ku, Kyoto, Japan.
authors.forename: Toshiaki A
authors.initials: TA
authors.lastname: Furukawa
authors.affiliation: Tokyo Metropolitan Matsuzawa Hospital, Setagaya, Tokyo, Japan.
authors.forename: Yuji
authors.initials: Y
authors.lastname: Okazaki
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D000374:Aggression; D015992:Body Mass Index; D002648:Child; D003430:Cross-Sectional Studies; D004038:Diet, Reducing / Q000523:psychology*; D005260:Female; D006801:Humans; D007564:Japan; D057566:Self Report; D013851:Thinness / Q000523:psychology; D014754:Violence