Description

The Eysenck Personality Questionnaire – Revised Short Scale (EPQ-RS) is a standardized psychometric instrument developed by Hans J. Eysenck and Sybil B. G. Eysenck to assess the fundamental dimensions of personality according to Eysenck’s biological theory of personality. The questionnaire consists of 48 self-report items and evaluates four major personality dimensions: Neuroticism, Extraversion, Psychoticism, and the Lie (Social Desirability) Scale. The instrument is designed to provide a rapid yet reliable assessment of stable personality characteristics that influence emotional functioning, interpersonal relationships, behavioral tendencies, and psychological adjustment.

According to Eysenck’s theoretical model, personality is largely determined by biologically based individual differences in central nervous system functioning. Neuroticism reflects emotional instability and vulnerability to psychological distress, Extraversion measures sociability, activity, and positive emotionality, Psychoticism assesses traits associated with aggressiveness, impulsivity, and unconventional thinking, while the Lie Scale evaluates the tendency to provide socially desirable rather than completely truthful responses. Together, these dimensions provide a comprehensive profile of adult personality and have been extensively used in psychological assessment, clinical practice, educational settings, occupational research, and personality studies.

The EPQ-RS is widely applied in clinical psychology, psychiatry, personality psychology, behavioral medicine, occupational psychology, educational psychology, counseling, epidemiology, and psychological research, where it serves as one of the most extensively validated instruments for evaluating personality traits across diverse cultural populations.

Data Analysis and Use

Data obtained from the Eysenck Personality Questionnaire – Revised Short Scale (EPQ-RS) are analyzed using comprehensive psychometric and statistical procedures designed to evaluate the four major personality dimensions assessed by the instrument. Individual responses are scored dichotomously and aggregated to calculate separate scores for Neuroticism, Extraversion, Psychoticism, and the Lie Scale, allowing researchers and clinicians to construct multidimensional personality profiles.

Psychometric evaluation commonly includes analyses of internal consistency using Cronbach’s alpha coefficient, together with assessments of test–retest reliability, construct validity, content validity, criterion validity, convergent validity, discriminant validity, and exploratory and confirmatory factor analyses (EFA/CFA). Measurement invariance, composite reliability, and item-response analyses are frequently performed to ensure robust psychometric performance across different demographic and cultural groups.

The questionnaire has been psychometrically evaluated in numerous countries, including Greece. The Greek validation study included 946 participants (422 men and 524 women) aged 16 to 73 years, demonstrating satisfactory levels of internal consistency and temporal stability for the majority of the personality dimensions, although the Psychoticism scale generally exhibited lower reliability compared with the remaining subscales. Statistical analyses typically include descriptive statistics, Pearson or Spearman correlation analyses, multiple regression models, structural equation modeling (SEM), cluster analysis, latent profile analysis, and comparative procedures such as t-tests and ANOVA to investigate relationships between personality traits and psychological, behavioral, educational, occupational, and health-related variables.

The EPQ-RS is extensively used in clinical assessment, personality research, epidemiological investigations, occupational selection, counseling, and longitudinal studies examining the role of personality in psychological well-being, mental disorders, coping strategies, health behaviors, and social functioning.

Objective

The primary objective of the Eysenck Personality Questionnaire – Revised Short Scale (EPQ-RS) is to provide a reliable, valid, and efficient assessment of adult personality according to Eysenck’s three-factor biological model of personality. The questionnaire enables psychologists, psychiatrists, researchers, counselors, and healthcare professionals to evaluate stable personality characteristics associated with emotional functioning, interpersonal behavior, cognitive style, psychological vulnerability, and behavioral adjustment.

The instrument facilitates the investigation of individual differences across the core personality dimensions while supporting research examining the relationship between personality and mental health, stress, emotional regulation, psychopathology, educational achievement, occupational performance, and quality of life. Furthermore, it contributes to evidence-based psychological assessment by providing standardized personality profiles that can support clinical evaluation, research, counseling, and intervention planning.

Scoring

The Eysenck Personality Questionnaire – Revised Short Scale (EPQ-RS) consists of 48 self-report items, with each item answered using a binary response format (“Yes” or “No”). Responses are scored as 1 or 0, depending on the scoring key, while reverse-scored items are coded in the opposite direction. Separate scores are calculated for the Neuroticism, Extraversion, Psychoticism, and Lie scales by summing the corresponding item responses.

Higher scores on Neuroticism indicate greater emotional instability, anxiety, and vulnerability to psychological distress. Higher Extraversion scores reflect greater sociability, activity, assertiveness, and positive affect. Higher Psychoticism scores indicate stronger tendencies toward impulsivity, aggressiveness, nonconformity, and unconventional behavior, whereas higher scores on the Lie Scale suggest a stronger tendency to present oneself in a socially desirable manner or to underreport socially undesirable characteristics.

Interpretation of questionnaire scores should always be supported by comprehensive psychometric evaluation, including analyses of Cronbach’s alpha coefficients, construct validity, criterion validity, exploratory and confirmatory factor analyses, normative comparisons, and cross-cultural validation, ensuring reliable assessment across diverse populations.

References

Alexopoulos, D. S., & Kalaitzidis, I. (2004). Psychometric Properties of Eysenck Personality Questionnaire-Revised (EPQ-R) Short Scale in Greece. Personality and Individual Differences, 37, 1205–1220.

Eysenck, H. J., & Eysenck, S. B. G. (1991). Eysenck Personality Questionnaire – Revised (EPQ-R). London: Hodder & Stoughton.

Eysenck, H. J. (1967). The Biological Basis of Personality. Springfield, IL: Charles C. Thomas.

Matthews, G., Deary, I. J., & Whiteman, M. C. (2009). Personality Traits (3rd ed.). Cambridge University Press.