Pechorro, PedroNunes, CristinaGoncalves, Rui AbrunhosaSimoes, Mario R.Oliveira, Joao Pedro2020-07-242020-07-242019-012183-6051http://hdl.handle.net/10400.1/14495The main aim of the present study was to translate and validate the Narcissistic Personality Inventory-13 (NPI-13) among a school sample (N=543) of male and female Portuguese youths. The NPI-13 demonstrated good psychometric properties, namely in terms of its three-factor structure, internal consistency, convergent validity, discriminant validity and criterion-related validity. Positive correlations were found with Conduct Disorder symptoms, alcohol use, drug use and unprotected sex. The psychometric properties of the NPI-13 mostly justify its use among Portuguese adolescents in a school context.porPsychopathic traits inventorySelf-esteemAntisocial-behaviorLinked narcissismAggressionGrandioseConstructDisorderValidityAdolescentsjournal article10.21865/RIDEP50.1.06