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The Boston Globe

Health & wellness

Be Well

Older child’s autism increases siblings’ risk

Children who have an older sibling with an autism spectrum disorder are nearly seven times more likely to be diagnosed with autism than those whose older siblings don’t have the disorder, a Danish study found.

Researchers from Aarhus University looked at data from about 1.5 million children born between 1980 and 2004 who had at least one full or half-sibling. Over 13,000 of the children had been diagnosed with autism, including 276 children who had an older sibling with the disorder.

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