title: Validity of proxy-based reports of impulsivity and aggression in Chinese research on suicidal behavior.
abstract: BACKGROUND
  In studies about the risk factors for suicidal behavior, the assessment of impulsiveness and aggression often depend on information from proxy informants.
  
  
  OBJECTIVE
  To assess the validity of proxy informants' reports on impulsiveness and aggression in China.
  
  
  METHODS
  Modified Chinese versions of the Barratt Impulsiveness Scale (BIS-CV) and the Buss-Perry Aggression Questionnaire (AQ-CV) were administered to 131 suicide attempters treated at a hospital in rural China, to coresident relatives about the attempters, to 131 matched community controls, and to coresident relatives about the controls.
  
  
  RESULTS
  BIS-CV and AQ-CV total scores and subscale scores were all significantly higher for suicide attempters than for matched controls. Proxy informants considered subjects slightly more impulsive and aggressive than the subjects reported themselves. Subject-proxy concordance for total BIS-CV and AQ-CV scores were excellent for both attempters and controls (ICCs = 0.76-0.83). Concordance for the three BIS-CV subscales was 0.74-0.81 for attempters and 0.74-0.83 for controls. Concordance for the five AQ-CV subscales was 0.66-0.85 for attempters and 0.56-0.82 for controls.
  
  
  CONCLUSIONS
  Results are based on respondents from a single location in rural China.
  
  
  CONCLUSIONS
  The results support the validity of the BIS-CV and AQ-CV and of research on suicidal behavior in China that uses proxy-based reports of impulsiveness and aggression.
authors.affiliation: WHO Collaborating Center for Research and Training in Suicide Prevention, Beijing Suicide Research and Prevention Center, Hui Long Guan Hospital, China.
authors.forename: Jing
authors.initials: J
authors.lastname: An
authors.forename: Michael R
authors.initials: MR
authors.lastname: Phillips
authors.forename: Kenneth R
authors.initials: KR
authors.lastname: Conner
mesh_terms: D000328:Adult; D000367:Age Factors; D000374:Aggression / Q000523:psychology*; D016022:Case-Control Studies; D002681:China; D005190:Family / Q000523:psychology; D005260:Female; D006801:Humans; D007175:Impulsive Behavior / Q000523:psychology*; D008297:Male; D011581:Psychological Tests; D015203:Reproducibility of Results; D012737:Sex Factors; D013406:Suicide, Attempted / Q000523:psychology*; D011795:Surveys and Questionnaires