Autism risks for siblings higher than thought
CHICAGO - August 15, 2011 (WPVI) -- 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.
- Snow/ Sleet Arriving
- WATCH: Action News Online
- 2013 Troop Greetings
- Sign up for Facebook Flash!
- Photos: Wintry weather forecast maps
- Man dressed as Santa struck, killed on I-95 26 min ago
- Police: Son of PHA employee charged with DUI
- Body found in Logan tire fire
- East Oak Lane apartment fire under control 7 min ago
- $10K reward in murder of Chester gas station owner
- South Africans hold day of prayer for Mandela
- Police: Pa. newlyweds killed man from Craigslist
- NJ officers play Santa for 'Shop with a Cop'
- Susan Boyle says Asperger's diagnosis was a relief
- Man dressed as Santa struck, killed on I-95
26 min ago