The percentage of children with autism worldwide has increased in recent years, but it's not clear whether this rise is due mainly to changes in how doctors diagnose autism and report cases, or if there is some factor in children's environment that is affecting autism rates. Now, a new study finds that most of the rise in autism cases in Denmark is due to changes in reporting practices. Researchers analyzed information from nearly 678,000 children born in Denmark from 1980 through 1991, who were followed until they were 22 years old. Changes in reporting practices could explain 60 percent of the increase in autism prevalence in Denmark over the last three decades, the researchers said.
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