A ratio of 1.5 to one doesn’t begin to explain whatever has been going on with autism over the past half century or so, autism existed in 1960 but it was hellishly rare.
That is what I thought too, I read several paragraphs and thought, "did she take into account that all the kids had vaccinations?"
I know they came out and said vaccinations were not in mercury and were safe but still, we didn't have these problems at this level back when I was a kid.
Misdiagnoses? fraud? that might explain alot, but not all.