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Several investigators have assessed the Psychopathy Checklist-Revised (PCL-R) for invariance across offender ethnicities and in correctional and forensic-psychiatric contexts. Yet we do not know whether, or to what extent, item properties among male offenders vary throughout adulthood. With a combined sample of PCL-R data on offenders from Canada and the United States (N = 4,82, we measured item properties for offenders in age groups of Early (18-30 years old), Middle (31-49 years old), and Late (50+ years old) adulthood. Nine items showed differential it
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