The Persian version of the Dimensional Obsessive-Compulsive Scale (P-DOCS): A psychometric evaluation

The Dimensional Obsessive-Compulsive Scale (DOCS) is a self-report measure of the severity of obsessive-compulsive symptoms (OCS) along with four dimensions. The aim of this study was to assess the factor structure, reliability and validity of the Persian version of the DOCS (P-OCDS) among patients with obsessive-compulsive disorder (OCD). A total of 764 outpatients with a DSM-IV diagnosis of OCD completed the P-DOCS, the Yale-Brown Obsessive-Compulsive Scale (Y-BOCS), the Vancouver Obsessive-Compulsive Inventory (VOCI), the Obsessive-Compulsive Inventory-Revised (OCI-R), the Penn State Worry Questionnaire-Short Form (PSWQ-SF), and the Beck Depression Inventory-II (BDI-II). Similar to the original version of the DOCS, results showed that the P-DOCS had a four-factor structure. Also, the P-DOCS showed good reliability through calculating McDonald's Omega and test-retest. In addition, convergent and discriminant validity of the P-DOCS was confirmed through its strong and weak correlations with other OCD measures and measures of global psychological distress respectively. Findings indicate that the DOCS is a reliable scale to use in Iranian clinical samples with OCD.