Dr. Kaye et al. found an OCD lifetime prevalence of 41% in subjects with eating disorders; the onset of OCD was reported as preceding the eating disorders in 23% of the cases. The authors acknowledged that these rates were not comparable with rates found in community samples. They suggested that this might be because of the use of the Yale-Brown Obsessive Compulsive Scale as well as the Structured Clinical Interview for DSM-IV (SCID) to determine lifetime rates of OCD. Dr. Kaye et al. proposed that OCD cases could have been missed had the SCID been used on its own because the subjects did not recognize the nature of their symptoms and did not endorse the SCID screening probe for OCD. Dr. Kaye et al. did not comment on how the Yale-Brown Obsessive Compulsive Scale was used to diagnose OCD. The Yale-Brown Obsessive Compulsive Scale has been validated and is used to determine the severity of current OCD; its scoring is based on current impairment, distress, resistance to obsessions and compulsions, and time spent on these. It is not a diagnostic instrument (3), and to our knowledge, it has not been validated as a lifetime measure. We would be curious to see the rates of OCD diagnosed by this method in the comparison group.