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Study Links Autism to Educated, Affluent Parents

Filed under: In The News, Research Reveals: Babies

Credit: UC Regents


Forget what former Playboy bunny turned autism activist Jenny McCarthy says. The skyrocketing rate of autism diagnoses may not be linked to childhood vaccines.

The Los Angeles Times reports that researchers at the University of California at Davis found clusters of kids with autism around the state. Then they looked for common denominators.

One of the biggest is that many of the kids come from homes with highly educated and often affluent parents. Most of these parents were white.

Autism specialists have often suspected as much. That may not be because of the children themselves. It could be that educated and affluent parents are more likely to have their children diagnosed and treated at an early age.
Nonetheless, the results of the study still surprised its senior author, epidemiologist Irva Hertz-Picciott. She was surprised, she told the Times, "not that there are clusters with parents with higher education, but that it was so consistent across the board."

The Times reports Hertz-Picciotto and her fellow researchers obtained birth records for 2,453,717 children born in California between 1996 and 2000. They picked those years because if children were going to be diagnosed with autism, it would have happened by now.

State records showed that about 9,900 autism cases were recorded with the Department of Developmental Services. Researchers identified 10 clusters of autism among the 21 regional offices of the department as well two other potential clusters.

"Looking at clustering is often a way to uncover leads about problems in the environment," Hertz-Picciotto tells the Times. "Mapping has a long history of being a way to get clues."

More children in the clusters probably were diagnosed with autism because of their parents' responses rather than anything in the air or drinking water, research team member Karla C. Van Meter tells the Times.

"In the U.S., the children of older, white and highly educated parents are more likely to receive a diagnosis of autism or autism spectrum disorder," she tells the Times.

"For this reason, the clusters we found are probably not a result of a common environmental exposure," she adds. "Instead, the differences in education, age and ethnicity of parents comparing births in the cluster versus those outside the cluster were striking enough to explain the clusters."

Team members are now looking for medical causes for the increased number of autism diagnoses.

The Times reports previous studies suggest exposure to pesticides may play a role. A study in Texas showed that exposure to mercury in the environment -- but, sorry Jenny, not in vaccines -- might be a factor.

"We are casting a wide net, looking at everything we can -- pesticides, medical conditions in the mother, medications, flame retardants, etc.," Hertz-Picciotto tells the Times.

Related:
Latest Study Refutes the Link Between Thimerosal and Autism, Autism: Real Epidemic or Trendy Diagnosis

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