Personality disorders do not influence the results of cognitive and behavior therapy for obsessive compulsive disorder

This study examined whether categorical or dimensional personality disorder variables affected treatment outcome in a sample of 52 patients with obsessive compulsive disorder who followed a standardized cognitive behavior therapy program. Treatment consisted of 12 weekly sessions and was completed by 43 patients. The Structured Clinical Interview for DSM-III-R personality disorders (SCID-II) was taken before the start of treatment by an independent rater. The treatment outcome measures included questionnaires and a Behavioral Assessment Test. Measurements were taken before and after treatment, and at 1 and 6 month follow-up tests. After the first follow-up test, further treatment was provided if clinically indicated. Neither categorical, nor dimensional personality disorder variables affected treatment outcome significantly. The inclusion of drop-outs in the analyses, did not change these results. Therefore, patients with obsessive compulsive disorder and concomitant personality disorder pathology should not be excluded from cognitive or behavior therapy for their obsessive compulsive complaints. Attributing therapy failure to concomitant Axis II pathology should be approached with caution.