[Self-evaluation of obsessive-compulsive disorder. Adaptation and validation of two psychometric scales to the French version]

Abstract

Reliable and valid measures of obsessive-compulsive behaviors are essential to investigation of obsessive-compulsive disorder (OCD). With observer-rated scales, accurate self-assessment is also required in the evaluation of OCD. In a collaborative study, two psychometric instruments for self assessment of OCD were translated and adapted into a french version: The Maudsley Obsessive-Compulsive Inventory (MOCI). and the Lynfield Obsessional-Compulsive Questionnaire (LOCQ) with 2 scores generated for "resistance" (LOCQ-R) and "interference" (LOCQ-I). The validity and the reliability of these two instruments were studied within different selected psychiatric groups, OCD, Panic disorder with or without Agoraphobia, Major Depression, and in a control group. Between-groups comparison showed that MOCI and LOCQ global scores (respectively 17 +/- 3.9 for MOCI global score, p < 0.01; and 40.3 +/- 11.0 for LOCQ-R, 43.1 +/- 12.0 for LOCQ-I global scores, p < 0.0001) can differentiate between the obsessional patients and the other groups. An overlap between OCD and Major Depression groups was observed on MOCI "doubting" and "slowness" sub-scores. By comparing MOCI and LOCQ global scores with observer-rated scales of obsessive-compulsive behaviour, we found adequate correlations: CPRS-OC (subscale of Comprehensive Psychiatric Rating Scale for Obsessions and Compulsions) (r > 0.5; p < 0.01), CAC (Compulsive Activities Check-list) (r > 0.6; p < 0.01), and global time spent on rituals (r > 0.5; p < 0.01). The total MOCI and LOCQ scores were significantly, but weakly correlated with depression and anxiety measures (r = 0.30-0.49).(ABSTRACT TRUNCATED AT 250 WORDS)