title: Trajectories of peer-nominated aggression: risk status, predictors and outcomes.
abstract: Developmental trajectories of peer-nominated aggression, risk factors at baseline, and outcomes were studied. Peer nominations of aggression were obtained annually from grades 1 to 3. Three developmental trajectories were identified: an early-onset/increasers trajectory with high levels of peer-nominated aggression at elementary school entry and increasing levels throughout follow-up; a moderate-persistent trajectory of aggression in which children were characterized by moderate levels of physical aggression at baseline; and a third trajectory with stable low levels of aggression. Children following the early-onset/increasers trajectory showed physical forms of aggression at baseline. Male gender and comorbid attention deficit/hyperactivity problems, oppositional defiant problems and poor prosocial behavior plus negative life events predicted which children would follow the early-onset/increasers trajectory of aggression. The outcomes associated with the early-onset/increaser children suggest high risk for chronically high levels of aggressive behavior.
authors.affiliation: Department of Child and Adolescent Psychiatry, Erasmus MC, Sophia, Rotterdam, The Netherlands. pac.van.lier@psy.vu.nl
authors.forename: Pol A C
authors.initials: PA
authors.lastname: van Lier
authors.forename: Alfons A M
authors.initials: AA
authors.lastname: Crijnen
mesh_terms: D000374:Aggression / Q000523:psychology*; D001289:Attention Deficit Disorder with Hyperactivity / Q000175:diagnosis / Q000453:epidemiology / Q000517:prevention & control; D019958:Attention Deficit and Disruptive Behavior Disorders / Q000175:diagnosis / Q000453:epidemiology / Q000517:prevention & control; D002648:Child; D002908:Chronic Disease; D015897:Comorbidity; D019955:Conduct Disorder / Q000175:diagnosis / Q000453:epidemiology* / Q000517:prevention & control*; D039721:Diagnostic and Statistical Manual of Mental Disorders; D005178:Faculty; D005260:Female; D006801:Humans; D015994:Incidence; D007398:Interpersonal Relations; D008297:Male; D015588:Observer Variation; D010379:Peer Group; D011446:Prospective Studies; D012307:Risk Factors