A Norwegian version of the Obsessive-Compulsive Inventory-Revised: psychometric properties.

The aims of this study were to test the psychometric properties of the Norwegian version of the Obsessive-Compulsive Inventory-Revised (OCI-R). The study included a student/community control sample (N = 1167) and a clinical sample (N = 72) with a diagnosis of obsessive-compulsive disorder (OCD). The results indicated a good fit for the six-factor structure of the OCI-R. The mean scores and standard deviations were similar to that of studies from other countries as was the internal consistency. The OCI-R scores were significantly higher in the OCD sample compared to the control sample. All the subscales, except hoarding, were significant predictors of obsessive-compulsive severity, and the OCI-R subscales seemed to be in agreement with the different subtypes of OCD according to DSM-IV. The OCI-R showed meaningful correlations with measures related to obsessive compulsive symptoms. As expected, it showed the strongest correlation with the Yale-Brown Obsessive Compulsive Scale, followed by measures of worry, anxiety, and depression. In summary, the Norwegian OCI-R showed adequate psychometric properties suggesting it could be a suitable measure of obsessive-compulsive symptoms.