Also, one should include advanced maternal age.I like Andrew Anglin's theory that "autism" is just a catch-all term for all the behavioral and mental problems people get as a result of the various poisons they are exposed to through vaccines and the tap water and the food and clothes and so on. Which is why it's a "spectrum" where some people have it and are perfectly capable of functioning in normal society, while some people have it and can't even speak, or can't leave their houses without special headphones.