• A A Mericle and B E Havassy.
• Dept. of Psychiatry, School of Medicine, University of California, San Francisco (UCSF), San Francisco, CA, USA. americle@tresearch.org
• Soc Psychiatry Psychiatr Epidemiol. 2008 May 1;43(5):392-402.

ObjectiveThe aim of this study was to describe the characteristics of recent interpersonal violence perpetrated and experienced by individuals recruited from acute crisis mental health and substance abuse treatment settings and to examine differences among incidents involving individuals with mental disorders only (MDO), substance use disorders only (SDO), and co-occurring mental and substance use disorders (COD).MethodParticipants (N = 419) were interviewed about their involvement in specific acts of violence in the past 30 days. Participants were also asked about where each incident took place, who was involved, whether individuals were injured, and whether alcohol or drugs were used before the incident. We examined distributions of violence characteristics for the full sample and used logistic regression analyses to test differences among incidents involving participants with MDO, SDO, and COD.ResultsApproximately 41% (n = 171) of the sample was involved in at least one incident of violence as a perpetrator or a victim, generating a total of 379 incidents. Far more incidents of violence involved victimization (62%) than perpetration (38%). Most incidents were isolated and involved only perpetration or only victimization. However, a total of 98 (26%) incidents occurred with another incident and constituted 49 episodes of violence that included incidents of perpetration and victimization. Characteristics of perpetration and victimization incidents were similar, except that victimization incidents involved more serious types of violence. The majority of incidents took place outdoors and did not result in injuries. Participants used drugs or alcohol prior to over 40% of incidents. Most incidents of perpetration (70%) targeted someone known to the participant. Diagnostic group was the strongest predictor of type of injury, location of incident, and use of alcohol and drugs before the incident. Individuals with substance use disorders, either alone or co-occurring with mental disorders, were more likely to report that violent incidents took place outdoors. Individuals with mental disorders, either alone or co-occurring with substance use disorders, were less likely to report alcohol and drug use prior to involvement in violence.ConclusionsViolence is common among individuals entering acute crisis mental health and substance abuse treatment. We found that such persons are more likely to report being victims of violence than perpetrators of violence. In contrast to prior studies, we found that most incidents took place outdoors. Although individuals in different diagnostic groups were no more or less likely to perpetrate or experience violence, they perpetrated and experienced violence under different circumstances. Implications and directions for future research and practice are discussed.

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