Behavior Genetics

, Volume 42, Issue 5, pp 711–721 | Cite as

Additional Evidence Against Shared Environmental Contributions to Attention-Deficit/Hyperactivity Problems

  • S. Alexandra BurtEmail author
  • Henrik Larsson
  • Paul Lichtenstein
  • Kelly L. Klump
Original Research


A recent meta-analysis “Burt (Psychol Bull 135:608–637, 2009)” indicated that shared environmental influences (C) do not contribute to Attention-Deficit/Hyperactivity Disorder (ADHD). Unfortunately, the meta-analysis relied almost exclusively on classical twin studies. Although useful in many ways, some of the assumptions of the classical twin model (e.g., dominant genetic and shared environmental influences do not simultaneously influence the phenotype) can artifactually decrease estimates of C. There is thus a need to confirm that dominant genetic influences are not suppressing estimates of C on ADHD. The current study sought to do just this via the use of a nuclear twin family model, which allows researchers to simultaneously model and estimate dominant genetic and shared environmental influences. We examined two independent samples of child twins: 312 pairs from the Michigan State University Twin Registry and 854 pairs from the PrE School Twin Study in Sweden. Shared environmental influences were found to be statistically indistinguishable from zero and to account for less than 5 % of the variance. We conclude that the presence of dominant genetic influences does not account for the absence of C on ADHD.


ADHD Nuclear twin family model Shared environment Genetic influences 



Sample one was supported by R01-MH081813 from the National Institute of Mental Health. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institute of Mental Health or the National Institutes of Health. Sample two was supported by grants from the Swedish Council for Working Life and Social Research and from the Swedish Research Council. The authors thank all participating twins and their families.


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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • S. Alexandra Burt
    • 1
    Email author
  • Henrik Larsson
    • 2
  • Paul Lichtenstein
    • 2
  • Kelly L. Klump
    • 1
  1. 1.Department of PsychologyMichigan State UniversityEast LansingUSA
  2. 2.Department of Medical EpidemiologyKarolinska InstitutetStockholmSweden

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