METACOGNITIVE ASSESSMENT OF OBSESSIVE COMPULSIVE DISORDER: VALIDITY AND RELIABILITY OF THE TURKISH VERSIONS OF THE THOUGHT FUSION INSTRUMENT, BELIEFS ABOUT RITUALS INVENTORY AND STOP SIGNALS QUESTIONNAIRE

Abstract

According to the metacognitive model which explains an innovative perspective, some scales have been developed to evaluate obsessive compulsive disorder (OCD). In this context, the validity and reliability of the Turkish version of Thought Fusion Instrument (TFI), Beliefs About Rituals Inventory (BARI) and Stop Signals Questionnaire (SSQ) were tested in this study. 140 university students participated in the study. Participants were asked to fill in TFI, BARI, SSQ and also Obsessive-Compulsive Inventory (OCI), Thought-Action Fusion Inventory (TAFI), Obsessive Beliefs Questionnaire (OBQ) and Penn State Worry Questionnaire (PSWQ). According to the results of factor analysis, While TFI and BARI consisted of a three-factor structure, SSQ consisted of a single factor structure. Cronbach’s α value of TFI was 0.883 (Cronbach’s α value of subscales was 0.751- 0.858), Cronbach’s α value of BARI was 0.856 (Cronbach’s α value of subscales was 0.737-0.885) and Cronbach’s α value of SSQ was 0.941. Corrected item-total correlation values with a range of TFI from 0.281 to 0.702, of BARI from 0.324 to 0.730 and of SSQ from 0.669 to 0.788. The eigenvalues of factors for TFI5.856, 1.660 and 1.115; for BARI 4.800, 1.742 1.222; and for BARI 7.300. These factors explained 61.6% of the total variance for TFI, 64.7% for BARI and 60.8% for SSQ. Correlation of the scales was assessed with other OCD scales (for OCI r = 0.167-0.456, for TAFI r = 0.248-0.389, for OBQ r = 0.321-0.460, for PSWQ r = 0.206-0.258). The scales were found to be able to successfully distinguish between OCD and non-OCD groups (d = 0.43-0.88). Current findings have shown that the Turkish versions of the used TFI, BARI and SSQ in the OCD evaluation according to the metacognitive model are valid and reliable.