Environmental factors are more important than previously thought in understanding the causes of autism, and equally as important as genes, according to the largest study to date to look at how autism runs in families.
The study also shows that children with a brother or sister with autism are 10 times more likely to develop autism; 3 times if they have a half-brother or sister; and 2 if they have a cousin with autism, providing much needed information for parents and clinicians for assessing individual risk.
The study, which looked at over 2 million people, was led by researchers at King's College London, Karolinska Institutet in Sweden and Mount Sinai in the US, and is published in JAMA today
The study also shows that children with a brother or sister with autism are 10 times more likely to develop autism; 3 times if they have a half-brother or sister; and 2 if they have a cousin with autism, providing much needed information for parents and clinicians for assessing individual risk.
The study, which looked at over 2 million people, was led by researchers at King's College London, Karolinska Institutet in Sweden and Mount Sinai in the US, and is published in JAMA today
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