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The Predictive Validity of MACI Derived Clusters for Juvenile Sex Offenders




Ritter, Amber

Type of Degree





The Millon Adolescent Clinical Inventory scores from 648 juvenile sex offenders aged 12 - 19 (M = 15.88, SD = 1.43) were examined using cluster analysis in order to replicate five personality-based clusters identified in a previous study (Loper 2008). However, only three of the five clusters were able to be replicated in the population. The current cluster analysis identified the following five clusters: the Anxious/Submissive/Passive cluster, the Disorganized Disturbed cluster, the Dysthymic/Shame-Based/Negative Self-Image cluster, the Narcissistic/Delinquent cluster, and the Situational Offender cluster. Significant differences were observed between the clusters regarding history of sexual abuse, history of physical abuse, history of neglect, history of trauma, mental health treatment, previous and current psychotropic medication, the gender of the victim in the index offense, the victim’s age relative to the offender’s age in the index offense, and the age of the first victim. Cluster membership was unrelated to the perpetrator’s relationship with the victim in the index offense, physical intrusiveness involved in the index offense, use of restraints in the index offense, age of the juvenile sex offender, juvenile sex offender’s age at first sexual abuse and physical abuse, and the number of victims. The recidivism data were collected from between 1 to 10.5 years (M = 4.55, SD = 2.77). However, no significant differences were found between the Kaplan-Meier survival curve estimates for non-violent, violent, or sexual re-arrest.