title: Detecting specialization in interpersonal violence versus suicidal behavior.
abstract: OBJECTIVE
  Research suggests that interpersonal violence and suicidal behavior often co-occur and share a common set of risk factors. This study examined (1) the extent to which individuals specialize in interpersonal violence or suicidal behavior and (2) the shared and unique covariates of individual specialization.
  
  
  METHODS
  The Project on Human Development in Chicago Neighborhoods is a longitudinal study of youths embedded within neighborhoods in metropolitan Chicago. Interviews with youths (average age, 15 years at baseline) and their primary caregivers were conducted from 1994 to 1997 (baseline) and from 1997 to 2000 (Wave 2). Analysis used an item response theory-based statistical approach on 19,502 interpersonal violence and suicidal behavior item responses from 1,628 youths within 74 neighborhoods to assess the degree to which individuals specialize in either interpersonal violence (ranging from hitting someone to shooting someone) or suicidal behavior (ideation, planning, and attempted suicide). The extent to which variables distinguished interpersonal violence and suicidal behavior was assessed.
  
  
  RESULTS
  Individuals who engaged in high levels of interpersonal violence were unlikely to engage in suicidal behavior. Conversely, individuals who engaged in high levels of suicidal behavior were also likely to engage in interpersonal violence. Several shared (e.g., residential stability, substance use) and distinguishing (e.g., exposure to violent peers, depression) correlates of interpersonal violence and suicidal behavior were detected.
  
  
  CONCLUSIONS
  Interventions that address both self- and outward-directed violence must be evidence based. Addressing violence prevention among youths at risk for suicidal behavior appears warranted, but targeting risk factors for suicide among the most violent youths may not be justified.
authors.affiliation: School of Criminology and Criminal Justice, Northeastern University, Boston, Massachusetts. Electronic address: g.zimmerman@neu.edu.
authors.forename: Gregory M
authors.initials: GM
authors.lastname: Zimmerman
authors.affiliation: Department of Criminal Justice and Criminology, Georgia Southern University, Statesboro, Georgia.
authors.forename: Chad
authors.initials: C
authors.lastname: Posick
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior / Q000523:psychology*; D002641:Chicago; D005260:Female; D006801:Humans; D007398:Interpersonal Relations; D008137:Longitudinal Studies; D008297:Male; D012307:Risk Factors; D059020:Suicidal Ideation; D013406:Suicide, Attempted / Q000523:psychology* / Q000706:statistics & numerical data*; D014754:Violence / Q000523:psychology* / Q000706:statistics & numerical data*
keywords: Hierarchical linear models; Interpersonal violence; Item response theory; Specialization; Suicidal behaviors