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Link between OCD, ADHD, and hoarding

A recent study conducted by our group, and led by Brooke Sheppard, shows that the rate of ADHD is twice as high in individuals with childhood-onset OCD than in the general population (12% vs 6%).  Rates of ADHD (mostly the inattentive subtype) were even higher among individuals who had compulsive hoarding symptoms, where the risk was increased 9-fold.  40% of individuals with childhood-onset OCD and hoarding symptoms had ADHD.  ADHD was not associated with any other psychiatric comorbidity (such as depression) in this study, which is in press in Depression and Anxiety.