CDC – Data and Statistics, Autism Spectrum Disorders – NCBDDD.
Here is the latest from the CDC and the prevalence of Autism.
1 in 88 kids are diagnosed with ASD (boys 1:54, girls 1:252)
Medical cost are about 6x’s higher with ASD kids, and additional cost ranging from $40-60,000/year.
There is a lot more information on the website too.