title: Associations between the practice of bullying and individual and contextual variables from the aggressors' perspective.
abstract: OBJECTIVE
  To estimate the prevalence of bullying among Brazilian students from the aggressor's perspective and to analyze its association with individual and contextual variables.
  
  
  METHODS
  This was a cross-sectional population-based study carried out with data from the National Survey on Student Health. A total of 109,104 students attending eight grade in public and private schools were included. Data were collected through a self-applied questionnaire. A model of association between bullying and variables in the following domains was tested: sociodemographics, risk behaviors, mental health, and family context. Univariate and multivariate analyses were also performed.
  
  
  RESULTS
  The prevalence of aggressors in bullying situations was 20.8%. The following variables remained associated in the final multivariate model: male gender (OR: 1.87; 95% CI: 1.79-1.94), lower participation of 16-year-old students (OR: 0.66; 95% CI: 0.53-0.82), and students from private schools (OR: 1.33; 95% CI: 1.27-1.39). Most aggressors reported feeling lonely (OR: 1.22; 95% CI: 1.16-1.28), insomnia episodes (OR: 1.21; 95% CI: 1.14-1.29), and a high prevalence of physical violence in the family (OR: 1.97 95% CI: 1.87-2.08). Aggressors missed classes more frequently (OR: 1.45; 95% CI: 1.40-1.51), and they regularly consumed more tobacco (OR: 1.21; 95% CI: 1.12-1.31), alcohol (OR: 1.85; 95% CI: 1.77-1.92), and illegal drugs (OR: 1.91; 95% CI: 1.79-2.04); they also demonstrated increased sexual intercourse (OR: 1.49 95% CI: 1.43-1.55) and regular exercise (OR: 1.20; 95% CI: 1.16-1.25).
  
  
  CONCLUSIONS
  The data indicate that bullying is an important aspect that affects the learning-teaching process and the students' health.
authors.affiliation: Escola de Enfermagem de Ribeirão Preto (EERP), Universidade de São Paulo (USP), Ribeirão Preto, SP, Brazil. Electronic address: wanderleio@usp.br.
authors.forename: Wanderlei Abadio de
authors.initials: WA
authors.lastname: Oliveira
authors.affiliation: Escola de Enfermagem de Ribeirão Preto (EERP), Universidade de São Paulo (USP), Ribeirão Preto, SP, Brazil.
authors.forename: Marta Angélica Iossi
authors.initials: MA
authors.lastname: Silva
authors.affiliation: Escola de Enfermagem de Ribeirão Preto (EERP), Universidade de São Paulo (USP), Ribeirão Preto, SP, Brazil.
authors.forename: Jorge Luiz da
authors.initials: JL
authors.lastname: Silva
authors.affiliation: Escola de Enfermagem de Ribeirão Preto (EERP), Universidade de São Paulo (USP), Ribeirão Preto, SP, Brazil.
authors.forename: Flávia Carvalho Malta de
authors.initials: FC
authors.lastname: Mello
authors.affiliation: School of Medicine, Universidade de São Paulo (USP), São Paulo, SP, Brazil.
authors.forename: Rogério Ruscitto do
authors.initials: RR
authors.lastname: Prado
authors.affiliation: School of Nursing, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG, Brazil.
authors.forename: Deborah Carvalho
authors.initials: DC
authors.lastname: Malta
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior / Q000523:psychology*; D000374:Aggression / Q000523:psychology; D000704:Analysis of Variance; D001938:Brazil; D058445:Bullying / Q000706:statistics & numerical data; D003430:Cross-Sectional Studies; D005260:Female; D006306:Health Surveys / Q000706:statistics & numerical data*; D006801:Humans; D008297:Male; D012574:Schools / Q000706:statistics & numerical data*; D012737:Sex Factors; D012907:Smoking / Q000523:psychology; D012959:Socioeconomic Factors; D011795:Surveys and Questionnaires; D014754:Violence / Q000706:statistics & numerical data
keywords: Assunção de riscos; Bullying; Family relations; Relações familiares; Risk-taking; Saúde escolar; School health