Abstract
Accurately and reliably measuring the presence and severity of Obsessive-Compulsive Disorder (OCD) symptoms is essential for both routine clinical work and research. The current study investigated psychometric properties of the dimensional obsessive-compulsive scale-short form (DOCS-SF). DOCS-SF was developed and validated in Norwegian. DOCS-SF contains a checklist with four symptom categories and five severity items scored on a zero to eight scale yielding a total score of 0–40. Data were collected from adults with a current diagnosis of OCD (n = 204) and a community comparison group (n = 211). The results provided evidence of internal consistency and convergent validity, although evidence for discriminant validity was mixed. Evidence was also found for diagnostic sensitivity and specificity, and treatment sensitivity. The analyses suggested a cut-off score of 16. In summary, the data obtained proved similar to studies published on the original dimensional obsessive-compulsive scale. There is strong evidence for the reliability and validity of the DOCS-SF for assessing OCD symptoms in individuals with this condition and in non-clinical individuals.
Highlights
Obsessive-compulsive disorder (OCD) is a heterogeneous condition, and factor-analytic research has consistently found clusters of symptoms along 3–5 dimensions (Mataix-Cols et al, 2005, 2016)
Yale-Brown ObsessiveCompulsive Scale (Y-BOCS) and Dimensional Obsessive-Compulsive Scale (DOCS)-SF yielded larger effect sizes compared to the Obsessive-Compulsive Inventory-Revised (OCI-R), PHQ-9, and GAD-7
We found that the area under the ROC curve (AUC) for the dimensional obsessive-compulsive scale-short form (DOCS-SF) was 0.98 [95% CI 0.97–0.99], suggesting that the test discriminated extremely well between patients diagnosed with Obsessive-Compulsive Disorder (OCD) and the comparison group
Summary
Obsessive-compulsive disorder (OCD) is a heterogeneous condition, and factor-analytic research has consistently found clusters of symptoms along 3–5 dimensions (Mataix-Cols et al, 2005, 2016). As a consequence of the need for a self-report measure that incorporates different symptom dimensions, Abramowitz et al (2010) developed the 20-item Dimensional Obsessive-Compulsive Scale (DOCS).The DOCS assesses the severity of the four most consistently replicated O-C symptom dimensions: (a) contamination/washing, (b) harm obsessions/checking compulsions, (c) symmetry/ordering, and (d) unacceptable thoughts. Brief Obsessive-Compulsive Disorder Symptom Assessment the number and types of obsessions and compulsions present, and does not confound the number of different types of obsessions and compulsions with severity. Each item is rated on a 0–4 scale, yielding a total score from 0 to 80 as well as individual subscale scores ranging from 0 to 20
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