Cross Cultural Adaptation and Psychometric Validation of the Obsessive-Compulsive Inventory-Revised (OCI-R) into Bangla

Author(s): Dr. Imdadul Magfur, Dr. RKS Royle, Dr. Ahmed Riad Chowdhury, Prof Susmita Roy, Dr. Rezwana Habiba, Dr. ASM Redwan, Dr. Md. Mahmudul Hasan.

Background: Obsessive Compulsive Disorder (OCD) is a chronic, disabling illness that imparts significant burden on the affected individual. Obsessive-Compulsive Inventory-Revised (OCI-R) is one of the most used scales across the globe, capable of screening, severity assessment, and evaluation of treatment outcome. Objective: To adapt and validate the Obsessive-Compulsive Inventory-Revised (OCI-R) scale into Bangla Methods: This was a cross-sectional validation study conducted at the Department of Psychiatry, Sylhet MAG Osmani Medical College Hospital, Sylhet, during the period of March 2022 to February 2024. The study population was OCD patients attending OPD and OCD clinic aged 18 years and above, and apparently healthy controls who were attendants of the patients, doctors, medical and nursing students. The OCI-R was adapted into Bangla with proper procedure. Forward and backward translation were followed by pilot testing and validation assessment. Results: Internal consistency, measured by Cronbach’s alpha found was 0.93. Construct validity assessed by principal axis factoring with varimax rotation revealed six factor structures. A good convergent validity assessed by total OCI-R score with total (r=0.805; p<0.05) and sub-scale of Y-BOCS score (r=0.786,0.817; p<0.05) and satisfactory discriminant validity (r=0.235, p<0.05) assessed by correlating between OCI-R total score with depression subscale of DASS-21 Bangla were revealed. A cut-off point of 21 in OCI-R could predict clinical diagnosis of OCD with 89.2% sensitivity and 91.8% specificity and the accuracy measured by area under the Receiver Operating Characteristic (ROC) curve was 0.97 (p<0.001). Conclusions: OCI-R Bangla version is a valid, reliable and culturally appropriate instrument for use in clinical contexts and future research for OCD.