New Jersey has the highest rates of autism in the U.S., but prevalence is highest in neighborhoods where annual incomes exceed $90,000.
Children who have more than one older sibling with autism have a one in three chance of developing the disorder themselves, according to a study published today in Pediatrics. The risk is higher for boys: Even if they have only one older sibling with autism, they are almost three times more likely than girls with the same family history to develop the disorder.
A new study of twins proposes the controversial claim that environmental influences during early development are just as, if not more, important than genetics. But the findings are not substantially different from those of previous twin studies, however, and some experts are critical of the study’s statistics.
A large population survey in England finds many adults with undiagnosed autism, bringing the disorder’s prevalence in adults to 1 in 100, approximately the same rate as in children, according to a report in May in the Archives of General Psychiatry.
Two large studies published in the past two months have found that traits linked to autism are widely distributed in the general population. Although about 1 in 100 children is diagnosed with autism, up to 30 percent of people may have at least one of the traits associated with the disorder.
A child in Australia is more likely to have autism if he or she is the first-born, is born to a woman who is older than 40 years, or belongs to a family of higher socio-economic status, according to a study published in March in PLoS One.