People who experience concussion are more likely to later be diagnosed with ADHD or other psychological disorders compared with the general population, a study suggests.

Researchers from Canada have shown patients with concussion are almost 40% more likely to develop ADHD and 72% more likely to develop mood or anxiety disorders.

In addition, there’s an increased risk of dementia diagnosis — of similar magnitude to mood disorders — and there’s a 57% increased risk of Parkinson’s disease, they say.

While previous studies have linked concussion with the development of psychological as well as neurological disorders, the researchers, from the University of Manitoba, said most research had relied on self-reported medical history or had failed to account for pre-existing health conditions.