Why? Have you got an agenda that you wish to push????
I read an article about Isreal doing this same type of study with similiar results over 5 years ago. Since people are now having children when they are older, it would make sense that that would be a reason why the cases of autism are rising.
Plus, every time they change the parameters of what autism consists of, the number of cases will change.
I've studied genetics and neurology among other courses in med school, and I like the physical sciences too. You could call me a science junkie. But this is not junk science.