Table 1.

Details of participants by region

Participants by region (Mothers of children with autism)
Region	Description	n	Boys (%)	Mean age (range)
High prevalence (1 in 84)	Minnesota, Maine, Oregon, Connecticut, Pennsylvania, Massachusetts, New Jersey, Indiana	22	73	6.5 years (2–16 years)
Low prevalence (1 in 234)	Iowa, Louisiana, Colorado, Oklahoma, New Mexico, Montana, Mississippi, Kansas	23	65	6.6 years (2–16 years)
Southwest region	Southern California and Central Arizona served by Colorado River water	32	81	5.4 years (2–18 years)
Other	Other states outside of the target regions	9	100	4.9 years (2–9 years)
Total	All of the United States combined from above	86	77	5.9 years (2–18 years)