CHICAGO (AP) -- A new study suggests that nearly 20 percent of children who have an autistic older brother or sister will develop the disorder too. That's a rate much higher than previously thought.
Researchers at the University of California at Davis followed 664 infants in the U.S. and Canada who had at least one older sibling with autism. About 19 percent, or 132 infants, ended up with an autism diagnosis as well by their third birthday.
Lead researcher Sally Ozonoff, who's with the UC Davis Mind Institute, says "We were all a bit surprised and taken aback about how high it is."
The highest rates were in infants who had at least two older siblings with autism -- that was 32 percent. Also, boys with autistic older siblings had a 26 percent chance of being diagnosed themselves versus 9 percent of girls. Autism is known to be more common in boys.
The study is in Monday's Pediatrics online.
To comment, the following rules must be followed:
Comments may be monitored for inappropriate content, but the station is under no legal obligation to do so.
If you believe a comment violates the above rules, please use the Flagging Tool to alert a Moderator.
Flagging does not guarantee removal.
Multiple violations may result in account suspension.
Decisions to suspend or unsuspend accounts are made by Station Moderators.
Questions may be sent to firstname.lastname@example.org.
Please provide detailed information.
All comments must adhere to the WSAW.com discussion rules.