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The Overvalued Ideas Scale: development, reliability and validity in obsessive-compulsive disorder
F Neziroglu1, D McKay, J A Yaryura-Tobias
1Institute for Bio-Behavioral Therapy and Research, Department of BioPsychoSocial Research, Great Neck, NY 11021, USA.
Behaviour Research and Therapy
|August 24, 1999
Summary
The Overvalued Ideas Scale (OVIS) reliably measures overvalued ideas in obsessive-compulsive disorder (OCD). This new scale shows good validity and may predict treatment outcomes for OCD patients.
Area of Science:
- Psychiatry
- Clinical Psychology
- Psychometrics
Background:
- Overvalued ideas in obsessive-compulsive disorder (OCD) are linked to poorer treatment outcomes.
- No quantitative measures currently exist to assess overvalued ideas in OCD patients.
Purpose of the Study:
- To examine the psychometric properties of the Overvalued Ideas Scale (OVIS).
- To assess the reliability and validity of the OVIS in a clinical population with OCD.
Main Methods:
- Two studies were conducted with patients diagnosed with OCD.
- Participants completed the OVIS along with other measures of psychopathology.
- Psychometric properties including internal consistency, test-retest, interrater reliability, convergent, and discriminant validity were evaluated.
Main Results:
- The OVIS demonstrated adequate internal consistency (alpha = 0.88), test-retest reliability (r = 0.86), and interrater reliability (r = 0.88).
- Convergent validity was moderate to high with measures of OCD symptoms and psychotic symptoms.
- Discriminant validity with anxiety and depression measures was moderate.
Conclusions:
- The OVIS is a reliable and valid measure for assessing overvalued ideas in OCD.
- Overvalued ideas appear stable in individuals with high scores.
- Further research with the OVIS may be valuable for predicting OCD treatment outcomes.