Psychometric properties of the French and English versions of the Vancouver Obsessional-Compulsive Inventory and the Symmetry Ordering and Arranging Questionnaire.

The Vancouver Obsessional-Compulsive Inventory (VOCI) and the Symmetry Ordering and Arranging Questionnaire (SOAQ) are self-report measures that assess a wide variety of symptoms and features of obsessive-compulsive disorder (OCD) including checking, contamination, obsessions, hoarding, "just right", indecisiveness, and symmetry, ordering and arranging obsessions and compulsions. The original English versions of the VOCI and SOAQ have been shown to demonstrate excellent psychometric properties. The present study examined the reliability and validity of French translations of these measures in a non-clinical sample, and also involved the collection of supplementary psychometric information about the English versions of the scales from a new sample. Volunteer undergraduate students completed questionnaire packages including the VOCI and SOAQ, as well as measures of obsessive-compulsive, phobic and depressive symptomatology in their native language of either French or English. Results indicate that the French versions of the VOCI and SOAQ demonstrate similar and excellent psychometric properties to the English versions and that these measures are highly valid and reliable assessment tools for use in clinical and research applications in both languages.