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01-09-2010 | Uitgave 3/2010

Journal of Psychopathology and Behavioral Assessment 3/2010

The Expanded Version of the Inferential Confusion Questionnaire: Further Development and Validation in Clinical and Non-Clinical Samples

Journal of Psychopathology and Behavioral Assessment > Uitgave 3/2010
Frederick Aardema, Kevin D. Wu, Yves Careau, Kieron O’Connor, Dominic Julien, Susan Dennie


The current study represents the further development and validation of an expanded version of the Inferential Confusion Questionnaire (ICQ-EV) in non-clinical and clinical samples. Inferential confusion seems to be particularly relevant to Obsessive-Compulsive Disorder (OCD) and is defined as a failure to recognize the unrealistic nature of obsessions due to a subjective form of reasoning. Factor analysis of the item-set of the ICQ-EV indicated a one-dimensional solution in non-clinical and clinical samples. It was hypothesized that inferential confusion as measured by the ICQ-EV would be particularly relevant to participants with OCD. Results confirmed convergent validity with strong relationships between the ICQ-EV and obsessive-compulsive symptoms in all samples independent of other cognitive domains and general distress. In addition, those with OCD scored higher on the ICQ-EV than non-clinical controls and a mixed anxiety disorder group so confirming group-criterion validity. Finally, the ICQ-EV also showed clinical validity with change in ICQ-EV scores during treatment significantly related to successful treatment outcome.

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