For the study, researchers from the University of Utah investigated whether head injury before the age of two could increase the risk of ADHD in a group of 62,088 children.
The study found higher rates of ADHD among children who suffered a head injury than in non-injured children.
The researchers conclude that head injury does not appear to cause ADHD but some other factor appears to be associated with early head injury and the development of ADHD.
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