One of the ongoing questions about the rise in autism spectrum cases

Autism Prevalence Unchanged in 20 Years

Interesting: One of the ongoing questions about the rise in autism spectrum cases is how much is an increase in diagnosis (not to mention expanding definitions, but that’s easier to adjust for) and how much is an increase in actual prevalence. A new study looks at data worldwide from 1990 to 2010 and finds that the rate has actually remained constant across that time. That suggests that the rise in documented cases is almost entirely due to better diagnostics.