Lifetime Costs: The typical total cost for a new septic system over a 20 year period is $6,300 to $13,000 for trenches and mounds, or $13,500 to $32,000 for alternative treatment systems. For multi-household systems, typical trench or mound systems range from $18,500 to $25,000.
Or perhaps because they only looked at children with autism in the Amish community. I wonder if they looked into how many Amish get things like chickenpox, smallpox, mumps, diphtheria, measles, rubella, whooping cough, shingles, the flu, HPV, rotavirus, etc etc.
Genetic Drift and the Founder Effect. Polydactyly -- extra fingers or sometimes toes -- is one symptom of Ellis-van Creveld syndrome. Genetically inherited diseases like Ellis-van Creveld are more concentrated among the Amish because they marry within their own community, which prevents new genetic variation from entering the population.