The present meta-analysis integrated effect sizes from 95 non-overlapping studies (N=15,826) to summarize the relation between Hare Psychopathy Checklists and antisocial conduct. Whereas prior meta-analyses focused on specific subdomains of the literature, we used broad inclusion criteria, incorporating a diversity of samples, settings, methodologies, and outcomes in our analysis. Our broad perspective allowed us to identify general trends consistent across the entire literature and improved the power of our analyses. Results indicated that higher PCL Total, Factor 1 (F(1)), and Factor 2 (F(2)) scores were moderately associated with increased antisocial conduct. Study effect sizes were significantly moderated by the country in which the study was conducted, racial composition, gender composition, institutional setting, the type of information used to score psychopathy, and the independence of psychopathy and transgression assessments. However, multiple regression analyses indicated that the information used to assess psychopathy did not have a unique influence on effect sizes after accounting for the influence of other moderator variables. Furthermore, racial composition of the sample was related to the country in which the study was conducted, making it unclear whether one or both of these moderators influenced effect sizes. We provide potential explanations for the significant findings and discuss implications of the results for future research.

The Psychopathy Checklist (PCUPCL-R) continues t o receive recognition among clinicians and researchers for its ability t o predict violent and nonviolent recidivism. This article reviews the psychometric properties and the clinical utility of the PCL-R and reports a metaanalysis of 18 studies that Investigate the relationship between the PCUPCL-R and violent and nonviolent recidivism. We found that the PCL and the PCL-R had moderate t o strong effect sizes and appear t o be good predictors of violence and general recidivism. As a component of dangerousness assessments, psychologists may want t o consider utilizing the PCL-R when making probability statements regarding placement decisions in institutions, parole and conditional release decisions, and community placement decisions for psychlatric patients. The generaliubility of the PCL beyond these groups, which have primarily consisted of AngloAmerican samples, is still in question and requires further research.

The authors examined the construct of psychopathy as applied to 103 female offenders, using the multitrait-multimethod matrix proposed by D. T. Campbell and D. W. Fiske (1959). Instruments used in the study included the following: (a) Antisocial Scale of the Personality Assessment Inventory (L. C. Morey, 1991); (b) Psychopathy Checklist--Revised (R. D. Hare, 1990); and (c) Antisocial scale of the Personality Disorder Examination (A. W. Loranger, 1988). Criterion-related validity was also evaluated to determine the relationship between psychopathy and staff ratings of aggressive and disruptive behavior within the institution. Results revealed significant convergence and divergence across the instruments supporting the construct of psychopathy in a female offender sample. The measures of psychopathy demonstrated moderate convergence with staff ratings of violence, verbal aggression, manipulativeness, lack of remorse, and noncompliance. It is interesting to note that an exploratory factor analysis of the PCL-R identified a substantially different factor structure for women than has been previously found for male psychopathy.

Despite a plethora of studies investigating psychopathy among male offenders, little is known about the applicability of this construct to female populations. Research has shown that prevalence rate, symptom presentation, and diagnostic comorbidity differ for females as compared to males. The current study is the first to examine the relationship between psychopathy and recidivism among women. Recidivism data on a sample of 78 female inmates were examined at a I-year interval in relation to the Psychopathy Checklist-Revised (PCL-R), inclusion criteria for the Antisocial Personality Disorder Diagnosis from the Personality Disorder Examination (PDE), and selected scales from the Personality Assessment Inventory (PAl; Antisocial and Aggression scales). The egocentricity subscale of the PAl, Factor I of the PCL-R, and the verbal aggression subscale of the PAl were the best predictors of future recidivism. Specific differences emerged between male and female offenders when comparing the present data with previous studies of male psychopaths.

This study examines the treatment response of 141 juvenile offenders with high scores on the Psychopathy Checklist:Youth Version ( M total > 27). Two groups of potentially psychopathic offenders are compared: one that participates in the Mendota Juvenile Treatment Center (MJTC), an intensive treatment program (MJTC, n = 56), and another that receives “treatment as usual” in conventional juvenile correctional institution (JCI) settings (JCI, n = 85). Offenders in the JCI group are more than twice as likely to violently recidivate in the community during a 2-year follow-up than those who participate in MJTC treatment. Treatment is associated with relatively slower and lower rates of serious recidivism, even after controlling for the effects of nonrandom assignment to treatment groups and release status. Implications for further research, treatment development, and juvenile justice issues are discussed.