title: [Prevalence and associated factors of school physical violence behaviors among middle school students in Beijing].
abstract: OBJECTIVE
  To described the prevalence of school physical violence behaviors and to explore its associated factors among middle school students in Beijing.
  
  
  METHODS
  In 2009, a randomly selected cross-sectional survey was conducted among 5718 students in grades 7 to 12 in Beijing. A self-report anonymous questionnaire involving physical violence at school and socio-demographic variables, such as sex, grades, family economic status and family structure, peer relationships, and communication with their parents etc. were completed by students themselves. Logistic regression was used to estimate the association between physical violence and socio-demographic variables.
  
  
  RESULTS
  Among the students, 14.3% reported that they had had physical violence behavior in school during the past 12 months. Male students had been more likely to have physical violence behaviors than female students (Male 25.2%, Female 5.1%). For both male and female students, poor school cohesion were the risk factors of physical violence behaviors (Male OR = 1.060, Female OR = 1.065). For male students, factors as father's lower education level (OR = 1.653), remarried/single-parent families (OR = 1.834), low-grade (grade 7 OR = 5.291; grade 11 OR = 1.526), poor school performance (OR = 1.470) etc were the risk factors of physical violence behaviors; while better-off family economic status (OR = 0.546), good peer relationships (OR = 0.618), and easy to communicate with the father (OR = 0.756) were the protective factors of physical violence behaviors. For female students, easy to communicate with her mother (OR = 0.358) were the protective factors of physical violence behaviors.
  
  
  CONCLUSIONS
  For male and female students, the prevalence of school physical violence and its related factors were different. Actions on prevention against physical violence behaviors should be fully considered, including factors as gender, personal characteristics, family, school and peers etc.
authors.affiliation: Institute of Child and Adolescent Health, Peking University, Beijing100191, China.
authors.forename: Yi-juan
authors.initials: YJ
authors.lastname: Qiao
authors.forename: Yi
authors.initials: Y
authors.lastname: Xing
authors.forename: Jia-li
authors.initials: JL
authors.lastname: Duan
authors.forename: Cheng-xu
authors.initials: CX
authors.lastname: Bai
authors.forename: Yong-ping
authors.initials: YP
authors.lastname: Pan
authors.forename: Yong-qiang
authors.initials: YQ
authors.lastname: Cui
authors.forename: Jun-hua
authors.initials: JH
authors.lastname: Kong
mesh_terms: D000293:Adolescent; D002681:China / Q000453:epidemiology; D003430:Cross-Sectional Studies; D003617:Dangerous Behavior; D005260:Female; D006801:Humans; D008297:Male; D010379:Peer Group; D012307:Risk Factors; D012309:Risk-Taking; D012574:Schools; D013334:Students / Q000523:psychology*; D011795:Surveys and Questionnaires; D014754:Violence / Q000706:statistics & numerical data