ADHD is statistically associated with lots of adverse mental health outcomes including... * Doubled rate of premature death (largely attributed to accidental i

ADHD is statistically associated with lots of adverse mental health outcomes including... * Doubled rate of premature death (largely attributed to accidental injury) * 47% anxiety disorder comorbidity * 38% severe mood disorder comorbidity (including depression) * 15% substance abuse disorder comorbidity Between the heightened risk of concussions, anxiety, depression, and substance abuse, it's not at all surprising that dementia shows up twice as often in the statistics. With that being said, it doesn't tell us much at all about whether there's a shared pathology.