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The Familial Co-Aggregation of Attention-Deficit/Hyperactivity Disorder and Intellectual Disability: A Register-Based Family Study
State University of New York Upstate Medical University, Syracuse, USA; K.G. Jebsen Centre for Research on Neuropsychiatric Disorders, University of Bergen, Bergen, Norway.
Karolinska Institutet, Stockholm, Sweden.
Karolinska Institutet, Stockholm, Sweden.
Karolinska Institutet, Stockholm, Sweden.
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2017 (English)In: Journal of the American Academy of Child and Adolescent Psychiatry, ISSN 0890-8567, E-ISSN 1527-5418, Vol. 56, no 2, 167-174.e1 p.Article in journal (Refereed) Published
Abstract [en]

Objective: Although many studies document an association between attention-deficit/hyperactivity disorder (ADHD) and intellectual disability (ID), little is known about the etiology of this comorbidity and how it should be addressed in clinical settings. We sought to clarify this issue.

Method: All individuals born in Sweden between 1987 and 2006 (n = 2,049,587) were identified using the Medical Birth Register (MBR). From this we selected 7 cohorts of relatives: 1,899,654 parent-offspring pairs, 4,180 monozygotic twin pairs, 12,655 dizygotic twin pairs, 914,848 full sibling pairs, 136,962 maternal half-sibling pairs, 134,502 paternal half-sibling pairs, and 2,790,164 full cousin pairs. We used within-individual and within-family analyses to assess the association between ADHD and ID.

Results: Individuals with ID were at increased risk for ADHD compared to those without ID, and relatives of participants with ID were at increased risk of ADHD compared with relatives of those without ID. The magnitude of this association was positively associated with the fraction of the genome shared by the relative pair and was lower for severe compared with mild and moderate ID. Model-fitting analyses demonstrated that 91% of the correlation between the liabilities of ADHD and ID was attributable to genetic factors.

Conclusion: These data provide evidence that nearly all of the comorbidity between ADHD and ID can be attributed to genetic factors, which has implications for diagnostic practice.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 56, no 2, 167-174.e1 p.
Keyword [en]
ADHD, intellectual disability, family, twin, genetics
National Category
Psychiatry Psychology Pediatrics
Identifiers
URN: urn:nbn:se:oru:diva-55415DOI: 10.1016/j.jaac.2016.11.011ISI: 000393446300013PubMedID: 28117063Scopus ID: 2-s2.0-85009964659OAI: oai:DiVA.org:oru-55415DiVA: diva2:1080616
Funder
Swedish Research Council, 2014-3831
Note

Funding Agencies:

K.G. Jebsen Centre for Research on Neuropsychiatric Disorders, University of Bergen, Bergen, Norway

European Union 602805  667302  643051

National Institute of Mental Health (NIMH) 5R01MH101519

Swedish Initiative for Research on Microdot in the Social And Medical Sciences (SIMSAM) 340-2013-5867

Available from: 2017-03-10 Created: 2017-03-10 Last updated: 2017-03-13Bibliographically approved

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CiteExportLink to record
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Citation style
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