Abstract
The Vancouver Obsessional-Compulsive Inventory (VOCI) is a self-report inventory developed to assess a wide range of Obsessive-Compulsive symptoms. The aim of this study was to investigate psychometric properties of the Persian version of the VOCI in non-clinical samples. A questionnaire package including the VOCI, BDI-II, BAI, MOCI, OCI-R and PSWQ was administered to volunteer undergraduate students (n = 233, 139 females, 94 males) from two Iran universities (Tehran University of Medical Sciences and Allameh Tabatabaei University). All the assessments were repeated in the same sample after 2 weeks. Psychometric analyses were run to assess reliability and validity of the Persian version of the VOCI. We converged an exploratory factor analysis to test the factor structure. The VOCI-Persian had good internal consistency, test-retest reliability, convergent and divergent validity. The present study showed that the factor structure of the questionnaire consisted of five main factors: VOCI Contamination, Checking, Obsessions, Hoarding and Perfectionism/Indecisiveness. Further studies are needed to develop psychometric tools with stronger diagnostic performance for OCD assessment.
Highlights
The importance of using reliable and valid symptom measures of obsessivecompulsive disorder (OCD) in both research and clinical settings is widely recognized
A questionnaire package including the Vancouver Obsessional-Compulsive Inventory (VOCI), Beck Depression Inventory-II-Persian Version (BDI-II), Beck Anxiety Inventory (BAI), Maudsley Obsessional-Compulsive Inventory (MOCI), Obsessional-Compulsive Inventory (OCI)-R and Penn State Worry Questionnaire (PSWQ) was administered to volunteer undergraduate students (n = 233, 139 females, 94 males) from two Iran universities (Tehran University of Medical Sciences and Allameh Tabatabaei University)
The present study showed that the factor structure of the questionnaire consisted of five main factors: VOCI Contamination, Checking, Obsessions, Hoarding and Perfectionism/Indecisiveness
Summary
The importance of using reliable and valid symptom measures of obsessivecompulsive disorder (OCD) in both research and clinical settings is widely recognized. One of the most important advantages of self-report instruments is the fact that they can be integrated into clinical practice to assess symptom presence and severity, and monitor treatment progress (Storch, Benito, & Goodman, 2011). Contamination/washing, symmetry/ordering and hoarding have been replicated consistently across factor-analytic studies, but some dimensions (such as checking, harming obsessions and immoral obsessions) need further study. It is unclear whether they form a common factor or separate dimensions (for a review, see Leckman et al, 2007). Working on the multidimensional OCD measures with valid symptom subscales and with satisfying psychometric properties is the potential to improve symptom-specific screening and treatment planning (Gönner, Ecker, Leonhart, & Limbacher, 2010)
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