The effect of comorbid schizotypal personality features in cognitive – behavioral therapy of Obsessive – Compulsive Disorder (OCD)

The aim of the present study was to study of the effect of positive and negative schizotypal personality features in cognitive behavior therapy of OCD. Thirty adults with OCD in three groups (pure OCD, OCD with positive schizotypal personality, OCD with negative schizotypal personality), selected availably from therapeutic centers of Tabriz. Participants received 12 sessions of weekly cognitive behavior therapy. Participants answered to schizotypal personality scale (STA), schizotypal personality questionnaire Brief (SPQ-B), Yale–Brown Obsessive–Compulsive Scale(Y-BOCS) and Structured Clinical Interview for DSM-IV Axis 1 Disorders (SCID-1). Data were analyzed using ANCOVA analysis of variance. Findings revealed that elevated scores in the positive schizotypal scales were highly predictive for treatment failure. Responders to treatment and non-responders did not significantly differ on scores in negative schizotypal scales. It is concluded that positive and negative schizotypal traits have different effect on treatment outcome of OCD. According to results, necessity of differences between positive and negative features of schizotypal personality must be emphasized in treatment outcome studies in case of OCD.