Table 1 Inclusion and Exclusion Criteria

Inclusion Criteria

• 18–50 years old

• Principal diagnosis of OCD

• YBOCS ≥16

• 18–50 years old

• Has sibling with OCD

• 18–50 years old

Exclusion Criteria

• Lifetime diagnosis of psychosis, bipolar disorder, anorexia, autism, or Tourette disorder

• Current chronic tic disorder, substance-use disorder, binge-eating disorder, bulimia, or suicidality

• Current use of psychotropic medications or CBT for OCD

• Current or lifetime psychiatric disorder other than MDD or anxiety disorders

• Current use of psychotropic medications

• Current or lifetime psychiatric disorder other than MDD or anxiety disorders (if not in past year)

• Current or past use of psychotropic medications

• First-degree relative with OCD or tic disorder