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Adaptation of the Narcissistic Personality Inventory among a Portuguese sample of incarcerated juvenile offenders

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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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Keywords: Assessment; Narcissistic Personality Inventory; psychometric properties; young offenders

Document Type: Research Article

Affiliations: 1: School of Psychology, University of Minho, Braga, Portugal 2: Department of Psychology, University of Georgia, Athens, GA, USA 3: Department of Criminal Justice, University of Texas at San Antonio, San Antonio, TX, USA 4: Research Centre for Spatial and Organizational Dynamics, University of Algarve, Faro, Portugal

Publication date: May 27, 2016

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