Researchers: Environmental factors outweigh genes in autism risk

07/4/2011 | Los Angeles Times (tiered subscription model)

Using data on 192 fraternal and identical twin pairs in which one or both has autism, researchers estimated that genetic factors accounted for only 38% of autism risk while 58% were attributable to environmental factors. However, experts were critical of the study, calling it "a massive claim" that deviates from the results of previous research. The findings appear in the Archives of General Psychiatry.

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