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Serious transport accidents in adults with attention-deficit/hyperactivity disorder and the effect of medication: a population-based study
Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden.
Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden.
Department of Psychological and Brain Sciences, Indiana University, Bloomington, United States .
Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden.
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2014 (English)In: JAMA psychiatry, ISSN 2168-6238, E-ISSN 2168-622X, Vol. 71, no 3, 319-325 p.Article in journal (Refereed) Published
Abstract [en]

Importance: Studies have shown that attention-deficit/hyperactivity disorder (ADHD) is associated with transport accidents, but the magnitude of the association remains unclear. Most important, it is also unclear whether ADHD medication reduces this risk.

Objectives: To estimate the association between ADHD and the risk of serious transport accidents and to explore the extent to which ADHD medication influences this risk among patients with ADHD.

Design, setting and participants: In total, 17,408 patients with a diagnosis of ADHD were observed from January 1, 2006, through December 31, 2009, for serious transport accidents documented in Swedish national registers. The association between ADHD and accidents was estimated with Cox proportional hazards regression. To study the effect of ADHD medication, we used stratified Cox regression to compare the risk of accidents during the medication period with the risk during the nonmedication period within the same patients.

Main outcomes and measures: Serious transport accident, identified as an emergency hospital visit or death due to transport accident.

Results: Compared with individuals without ADHD, male patients with ADHD (adjusted hazard ratio, 1.47; 95% CI, 1.32-1.63) and female patients with ADHD (1.45; 1.24-1.71) had an increased risk of serious transport accidents. In male patients with ADHD, medication was associated with a 58% risk reduction (hazard ratio, 0.42; 95% CI, 0.23-0.75), but there was no statistically significant association in female patients. Estimates of the population-attributable fractions suggested that 41% to 49% of the accidents in male patients with ADHD could have been avoided if they had been receiving treatment during the entire follow-up.

Conclusions and relevance: Attention-deficit/hyperactivity disorder is associated with an increased risk of serious transport accidents, and this risk seems to be possibly reduced by ADHD medication, at least among male patients. This should lead to increased awareness among clinicians and patients of the association between serious transport accidents and ADHD medication.

Place, publisher, year, edition, pages
Chicago, USA: American Medical Association , 2014. Vol. 71, no 3, 319-325 p.
National Category
Medical and Health Sciences Psychiatry
Identifiers
URN: urn:nbn:se:oru:diva-54559DOI: 10.1001/jamapsychiatry.2013.4174ISI: 000332769700014PubMedID: 24477798Scopus ID: 2-s2.0-84896775749OAI: oai:DiVA.org:oru-54559DiVA: diva2:1064366
Funder
Swedish Research Council
Note

Funding Agencies:

Swedish Council for Working Life and Social Research

National Institute of Child Health and Human Development 

Available from: 2017-01-12 Created: 2017-01-12 Last updated: 2017-10-18Bibliographically approved

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