Autism rate among Amish is one in 15000. Amish eat less process foods, refrain from immunization for education, and less surrounded by electronics. I think scientists need to study them and compare it to modern society for clues on autism. Note: A number of Amish families are immunizing for certain severe childhood illnesses. Would like to track these families for autism rates to determine if immunization affect it.
I bet the Amish don’t have ultrasounds done.