The aim of the present study was to assess the psychometric properties of the Narcissistic Personality Inventory (NPI) and two of its short forms (NPI-16 and NPI-13) among a Portuguese sample of male incarcerated juvenile offenders (N = 221). Of these, only the
NPI-13 short version demonstrated a good fit in terms of its factor structure. The NPI-13 also showed promising psychometric properties in terms of its internal consistency, convergent validity, discriminant validity, and criterion-related validity. Statistically significant associations were
found with age of crime onset, crime seriousness, conduct disorder symptoms, alcohol abuse, and cannabis use. These findings justify the use of the NPI-13, especially its Entitlement/Exploitativeness dimension, among incarcerated male youths.
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Narcissistic Personality Inventory;
Document Type: Research Article
School of Psychology, University of Minho, Braga, Portugal
Department of Psychology, University of Georgia, Athens, GA, USA
Department of Criminal Justice, University of Texas at San Antonio, San Antonio, TX, USA
Research Centre for Spatial and Organizational Dynamics, University of Algarve, Faro, Portugal
May 27, 2016