title: Psychometric examination and normative data for the narcissistic personality inventory 29 item version.
abstract: The Narcissistic Personality Inventory (NPI) is commonly used in empirical studies of narcissism. Few population-based studies have been published. Our aim was to do a confirmatory factor analysis (CFA) of the NPI 29 item version with a four-factor structure, in two population-based samples and in a patient sample, and present normative population-based data. The NPI-29 was filled in by 324 respondents from the Norwegian population, 231 from the Swedish population and 167 Norwegian psychiatric patients. The four-factor structure of the NPI-29 with Leadership/Power, Exhibitionism/Self-admiration, Superiority/Arrogance and Uniqueness/Entitlement was reproduced in these samples. The CFA models showed good fit indices in all samples. Mean scores on the NPI-29 and four subscales hardly differed between the samples. For the NPI-29 total score and factors, few significant differences were observed. CFA of the samples supported the factor structure of the NPI-29 formerly identified by principal component analysis of the Swedish population sample.
authors.affiliation: Department of Psychiatry, Sunnmore Hospital, 6026 Aalesund, Norway. marit.svindseth@mac.com
authors.forename: Marit F
authors.initials: MF
authors.lastname: Svindseth
authors.forename: Oystein
authors.initials: O
authors.lastname: Sørebø
authors.forename: Jim Aage
authors.initials: JA
authors.lastname: Nøttestad
authors.forename: John Olav
authors.initials: JO
authors.lastname: Roaldset
authors.forename: Juliska
authors.initials: J
authors.lastname: Wallin
authors.forename: Alv A
authors.initials: AA
authors.lastname: Dahl
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D003431:Cross-Cultural Comparison; D005163:Factor Analysis, Statistical; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009289:Narcissism; D009664:Norway / Q000453:epidemiology; D010554:Personality Disorders / Q000175:diagnosis* / Q000453:epidemiology*; D010555:Personality Inventory / Q000706:statistics & numerical data*; D011159:Population Surveillance; D025341:Principal Component Analysis; D011594:Psychometrics / Q000379:methods*; D015203:Reproducibility of Results; D013548:Sweden; D055815:Young Adult