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  • Title: Examining the relationship between obsessive-compulsive disorder and attention-deficit/hyperactivity disorder in children and adolescents: a familial risk analysis.
    Author: Geller D, Petty C, Vivas F, Johnson J, Pauls D, Biederman J.
    Journal: Biol Psychiatry; 2007 Feb 01; 61(3):316-21. PubMed ID: 16950231.
    Abstract:
    BACKGROUND: To use family study methodology to examine the relationship between obsessive-compulsive disorder (OCD) and attention-deficit/hyperactivity disorder (ADHD) in children and adolescents. METHODS: We assessed for ADHD and OCD in the 1533 first-degree relatives of three groups of index children: those with ADHD and OCD, those with ADHD but no OCD, and matched controls with neither disorder. RESULTS: The risk for ADHD was similarly elevated in families of ADHD youth with (18.9%) and without OCD (20.1%; p = .91), and both groups had significantly higher rates of ADHD compared with controls (4.6%; p < or = .001), which was consistent with previous research showing a strong familial risk for ADHD. The risk for OCD was significantly elevated only among relatives of youth with ADHD plus comorbid OCD (13.0%) compared with controls (.5%; p < or = .001) and was consistent with previous research showing a strong familial risk for OCD. Relatives affected with ADHD had a significantly elevated risk for OCD compared with relatives unaffected by ADHD (7.4% vs. 1.3%; p < .001), suggestive of co-segregation between these disorders. There was no evidence of nonrandom mating between ADHD- and OCD-affected spouses. CONCLUSIONS: These results extend previously reported findings regarding the heritability of both ADHD and OCD and provide new evidence of a familial relationship between ADHD and pediatric OCD that best fits the hypothesis of a unique familial subtype.
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