Obsessive compulsive personality disorder as a predictor of exposure and ritual prevention outcome for obsessive compulsive disorder

► This is the first study to test OCPD as a predictor of EX/RP outcome for OCD. ► Both OCPD diagnosis and greater OCPD severity predicted worse EX/RP outcome. ► Perfectionism is the OCPD criterion most strongly associated with poor EX/RP outcome. ► Incorporating treatments that target OCPD traits into EX/RP may improve OCD outcome.