The current study examined clinical correlates and treatment response as they relate to auxiliary clinical characteristics (i.e., insight; avoidance; indecisiveness; sense of responsibility; pervasive slowness; pathological doubt; duration of obsession-free and compulsion-free intervals) in 172 adults with OCD. A trained evaluator administered the Yale-Brown Obsessive Compulsive Scale and the Anxiety Disorders Interview Schedule for DSM-IV. As well, patients completed the Obsessive Compulsive Inventory-Revised; Beck Depression Inventory-Second Edition; State-Trait Anxiety Inventory; RAND 36-Item Health Survey; and Sheehan Disability Scale. Results indicated numerous associations between auxiliary OCD features and both depressive and anxious symptoms as well as impaired health and functioning. All auxiliary features, excluding insight, were reduced following cognitive-behavioral therapy. In particular, changes in symptom-free intervals; avoidance; and indecisiveness were most reliably associated with reductions in core OCD features. The lack of a relationship with insight did not come as a surprise, as insight is considered a relatively stable construct in those with OCD. Implications of these findings in the assessment and treatment of patients with OCD are highlighted.