Background: The aim of the study was to investigate the psychometric properties of the Persian version of the 20-item Fear of Self Questionnaire (FSQ) in Iranian samples.
Methods: A cross-sectional, descriptive survey design was used. Students in universities of Tehran were invited to participate. Participants were asked to complete the Persian versions of the FSQ, Vancouver Obsessional Compulsive Inventory (VOCI), Depression, Anxiety and Stress Scale (DASS-21), Ego Strength Scale (ESS), and Rosenberg's Self-Esteem Scale (RES). Face, content, and construct validity, internal consistency (Cronbach's alpha), and test-retest reliability of the FSQ were assessed.
Results: Face and content validity of the FSQ were confirmed. Analysis of the principal components using the inclined rotation method showed that there were two factors with an eigenvalue >1, which explained 80.5% of the total variance. The first factor had 12 items and the second factor had 8 items. The internal consistency was 0.975, 0.981, and 0.941 for the total score and the first and second factor, respectively, whereas the test-retest reliability was 0.732, 0.729, and 0.714, respectively (all p ≤ 0.01). For convergent validity of the FSQ, correlations of the total score and the two factors of the FSQ with the scores of VOCI, RES, ESS, and DASS-21 were all significant (p ≤ 0.01).
Conclusion: The FSQ can be used in Iranian samples for clinical practice and research.
Keywords: Obsessive-compulsive disorder; Psychometrics; Reproducibility of results.