Scale Analysis and Purpose

The Narcissistic Personality Inventory (NPI-40) was developed by Raskin and Hall in 1979 and deals with psychological health and resilience, as well as with aggressiveness and reduced interpersonal relationships. The Narcissistic Personality Inventory was created with the aim of measuring individual differences in narcissism as a stable personality trait. It includes seven factors: authority, self-sufficiency, superiority, exhibitionism, exploitativeness, vanity, and entitlement.

Question Calibration

In its original version, the questionnaire included 40 pairs of statements referring to the seven aforementioned factors. In the Greek version of the test, 10 pairs of statements were removed. Participants are asked to choose one statement from each pair, depending on which one best suits their character.

Statistical Analysis

The questionnaire produces a total score as the sum of the responses that indicate the presence of narcissistic traits. The score ranges from 0 to 40. Scores between 3–9 indicate a low level of narcissism, 10–17 indicate a medium level, and scores above 21 indicate a high level. Higher values suggest greater levels of narcissism.

Validity and Reliability

The questionnaire has been adapted into Greek by two experienced psychologists and translated using the back-translation method, with 10 items removed so that the Greek sample contains 30 questions. Internal consistency was acceptable, with a Cronbach’s alpha of 0.82.

References

Authors: R. N. Raskin and C. S. Hall (1979)
Raskin, R., & Terry, H. (1988). A principal components analysis of the Narcissistic Personality Inventory and further evidence of its construct validity. Journal of Personality and Social Psychology, 54, 890–902.