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Journal of Learning Disabilities
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ADHD and Dyscalculia

Evidence for Independent Familial Transmission

Michael C. Monuteaux

Harvard Medical School

Stephen V. Faraone

Department of Epidemiology at the Harvard School of Public Health

Kathleen Herzig

Harvard Medical School Department of Psychiatry at the Massachusetts General Hospital

Neha Navsaria

Massachusetts General Hospital

Joseph Biederman

Massachusetts General Hospital, Adult ADHD Program at the Massachusetts General Hospital, Harvard Medical School

The familial relationship between dyscalculia and attention-deficit/hyperactivity disorder (ADHD) was assessed. We conducted a familial risk analysis using probands with and without ADHD of both genders and their first-degree relatives. Participants were assessed with structured diagnostic interviews and a cognitive test battery. We found elevated rates of ADHD in relatives of both ADHD proband groups, regardless of dyscalculia status, and elevated rates of dyscalculia in relatives of probands with dyscalculia, irrespective of ADHD status. There was no evidence for cosegregation or assortative mating. Our findings support the hypothesis that ADHD and dyscalculia are independently transmitted in families and are etiologically distinct. These results reinforce the current nosological approach to these disorders and underscore the need for separate identification and treatment strategies for children with both conditions.

Journal of Learning Disabilities, Vol. 38, No. 1, 86-93 (2005)
DOI: 10.1177/00222194050380010701
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