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Evidence abounds that the incidence of children diagnosed with autism is on the rise. For example, in the state of Washington the number of students with autism jumped from 2,104 in 2001 to 6,000 in 2007. In the United Kingdom, the rate of autism diagnosis has risen from 50 in 100,000 in 1990 to 400 per 100,000 today.
Theories about the cause of this rise also abound, identifying a wide range of environmental factors. However, Dr. Dorothy Bishop and her colleagues at Oxford University now are proposing a much simpler explanation — that in the past many children with autism were misdiagnosed. Her article in the May 2008 issue of Developmental Medicine & Child Neurology, describes a research project where 38 teenagers who, as young children, were diagnosed as having a developmental language disorder. The researchers went back and re-diagnosed these children by interviewing them and their parents. The result was that fully one-third of these children were misclassified and, in fact, under current procedures, would have been considered to have some form of autism. Dr. Bishop concludes that while we should not assume that other factors are not still involved, it appears that a major cause for the increase in autism is simply changes in diagnostic criteria.
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