title: Prevalence and risk factors for violent behavior in young people presenting with first-episode psychosis in Hong Kong: A 3-year follow-up study.
abstract: OBJECTIVE
  The aim of the current study was to examine the rates of violence prior to and 3 years following treatment initiation, and predictors of post-treatment violence in Chinese young people presenting with first-episode psychosis (FEP).
  
  
  METHODS
  Seven hundred patients aged 15-25 years consecutively enrolled in a territory-wide early intervention program for FEP in Hong Kong from July 2001 to August 2003 were studied. Socio-demographic, pre-treatment, baseline and 3-year follow-up variables were collected via systematic medical file review. Violent behavior was defined as physical aggression towards people and was further categorized at two levels of severity.
  
  
  RESULTS
  After onset of psychosis, 6.7% (n = 47) patients exhibited violence before treatment. During 3-year treatment period, 9.4% (n = 66) committed violent behavior and 4.3% (n = 30) perpetrated serious violence. Two-fifths (40.4%) of patients who displayed pre-treatment violent behavior engaged in further act of violence after service contact. Multivariate regression analysis showed that previous violence, male gender and lower educational attainment were significantly associated with an increased risk of violence during 3-year follow-up. Comorbid substance, male gender, lower educational level and past history of violence were found to independently predict occurrence of serious violence after commencement of treatment for FEP.
  
  
  CONCLUSIONS
  In a large representative cohort of Chinese young FEP patients, the rates of violent behavior before and after treatment were relatively lower than that reported in the literature. Risk factors for violence identified by the current study were comparable to the findings of previous research conducted in western populations. Close monitoring of patients with history of violence and specific treatments targeting at minimizing substance abuse may facilitate early identification and intervention of high-risk cases to reduce violence risk in the early course of illness.
authors: Department of Psychiatry, The University of Hong Kong, Queen Mary Hospital, Hong Kong The State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong, Hong Kong changwc@hku.hk.
authors: Wing Chung
authors: WC
authors: Chang
authors: Department of Psychiatry, The University of Hong Kong, Queen Mary Hospital, Hong Kong.
authors: Sherina Suet In
authors: SS
authors: Chan
authors: Department of Psychiatry, The University of Hong Kong, Queen Mary Hospital, Hong Kong.
authors: Christy Lai Ming
authors: CL
authors: Hui
authors: Department of Psychiatry, The University of Hong Kong, Queen Mary Hospital, Hong Kong The State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong, Hong Kong.
authors: Sherry Kit Wa
authors: SK
authors: Chan
authors: Department of Psychiatry, The University of Hong Kong, Queen Mary Hospital, Hong Kong.
authors: Edwin Ho Ming
authors: EH
authors: Lee
authors: Department of Psychiatry, The University of Hong Kong, Queen Mary Hospital, Hong Kong The State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong, Hong Kong.
authors: Eric Yu Hai
authors: EY
authors: Chen
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D005500:Follow-Up Studies; D006723:Hong Kong / Q000453:epidemiology; D006801:Humans; D008297:Male; D015995:Prevalence; D011379:Prognosis; D011618:Psychotic Disorders / Q000453:epidemiology* / Q000503:physiopathology / Q000628:therapy; D012307:Risk Factors; D014754:Violence / Q000706:statistics & numerical data*; D055815:Young Adult
keywords: Violence; first-episode psychosis; prediction; prevalence; risk factors