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Predicting Short-Term Institutional Aggression in Forensic Patients: A Multi-Trait Method for Understanding Subtypes of Aggression

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Law and Human Behavior

Abstract

Accurately predicting inpatient aggression is an important endeavor. The current study investigated inpatient aggression over a six-month time period in a sample of 152 male forensic patients. We assessed constructs of psychopathy, anger, and active symptoms of mental illness and tested their ability to predict reactive and instrumental aggression. Across all levels of analyses, anger and active symptoms of mental illness predicted reactive aggression. Traits of psychopathy, which demonstrated no relationship to reactive aggression, were a robust predictor of instrumental aggression. This study (a) reestablishes psychopathy as a clinically useful construct in predicting inpatient instrumental aggression, (b) provides some validation for the reactive/instrumental aggression paradigm in forensic inpatients, and (c) makes recommendations for integrating risk assessment results into treatment interventions.

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Notes

  1. In the state the study occurred in, individuals found not guilty by reason of insanity (NGRI) have the legal right to petition for conditional release every 6 months. As such, even a patient who could remain in the hospital for the rest of his life could be conditionally released 6 months after being found NGRI.

  2. Interpretation of AUC curves are as follows: .90–1 excellent; .80–.90 good; .70–.80 fair, .60–.70 poor; and .60–.50 are considered fail and indicate chance performance.

  3. For the sake of comparison we predicted verbal aggression. The criterion variables that were significant predictors of verbal aggression included WARS Part A (AUC = .71) and Part B (AUC = .77), BPRS Resistance (AUC = .68), BPRS Activation (AUC = .66), and PCL:SV Lifestyle (AUC = .65) and Antisocial tendencies (AUC = .67).

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Vitacco, M.J., Van Rybroek, G.J., Rogstad, J.E. et al. Predicting Short-Term Institutional Aggression in Forensic Patients: A Multi-Trait Method for Understanding Subtypes of Aggression. Law Hum Behav 33, 308–319 (2009). https://doi.org/10.1007/s10979-008-9155-7

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