This study examined the relations between psychopathy scores and violent behavior in 113 incarcerated adolescents. We compared the results of four different instruments designed to assess psychopathy features among juveniles-the Psychopathy Checklist: Youth Version (PCL:YV), two versions of the Antisocial Processes Screening Device (APSD), and a Psychopathy Content scale on the Millon Adolescent Clinical Inventory (MACI). We found that PCLY:YV scores were significantly correlated with violent offense history, unadjudicated violence, and institutional violence, as well as measures of the severity and instrumentality of prior violence. Receiver operating characteristic analyses generated statistically significant effect sizes (AUC values) ranging from 0.64 to 0.79. The three other measures generated statistically significant correlations with one or more of the violence criteria, although correlations and effect sizes tended to be smaller in magnitude. Our results offer some support for the validity of these measures of psychopathic features, and the value of the PCL:YV in particular, with respect to short-term measures of violence outcome among juvenile offenders.
This prospective study found that self-reported attitudes toward peer aggression among 403 middle school students were both internally consistent (Cronbach's alphas = .81 and .82) and stable over time (7-month test—retest r = .66). Most notably, aggressive attitudes were correlated with 4 outcome criteria for aggressive behavior: student self-report of peer aggression, peer and teacher nominations of bullying, and school discipline referrals. Significant correlations ranged from .09 to .37. Receiver operating characteristic analyses resulted in effect sizes ranging from .59 to .75. Overall, this study demonstrates that assessment of student attitudes toward aggression yields concurrent and predictive information related to a range of aggressive and disruptive behaviors in middle school.
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