"Amish children who, as a rule, are not vaccinated. Not one case of autism in this population."
Well, the Amish are also a small, largely closed, genetic pool, that is, by definition, non-technical.
The study was compared to a population of poverty level childen in Chicago who also were not vaccinated. The findings correlated. No autism in the Chicago population.
The study in England was much larger and more definitive.