TIL that age relative to classmates is one of the best predictors of ADHD diagnosis, with the youngest children in a class up to 70% more likely to be diagnosed with the disorder. User odisant, in the Today I Learned (TIL) subreddit, 24 May 2013
Influence of relative age on diagnosis and treatment of attention-deficit/hyperactivity disorder in children. User trifecta, in the Reddit Science subreddit, 07 Mar 2012