&gt; What about ADHD in populations where there are few whites, say Asia, Africa, what has been observed there?<p>This is a great question. ADHD diagnosis rates vary pretty significantly between the US and Europe (due to diagnostic and cultural differences), and Japan would be a great datapoint. It seems like ADHD prevalence is relatively understudied in Japan, different symptomatic behaviors are viewed as troubling, and there is a much more dim view of stimulant medication.<p>But we don&#x27;t need to inject race and gender into everything. It already came that way ;)