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    Rise in autism cases may not be real

    Study suggests rise in autism cases may not be real
    Mon Apr 3, 2006

    CHICAGO (Reuters) - A rise in autism cases is not evidence of a feared epidemic but reflects that schools are diagnosing autism more frequently, a study said on Monday.
    Children classified by U.S. school special education programs as mentally retarded or learning disabled have declined in tandem with the rise in autism cases between 1994 and 2003, the author of the study said, suggesting a switch of diagnoses.

    Government health authorities have been trying to allay widely publicized concerns that vaccines containing the mercury-containing preservative therimerosal, which is no longer used, were behind an autism epidemic.

    There may be as yet unknown environmental triggers behind autism, study author Paul Shattuck of the University of Wisconsin at Madison said, but his research suggested the past decade's rise in autism cases was more of a labeling issue.

    Autism was fully recognized in 1994 by all U.S. states as a behavioral classification for schoolchildren, who receive individualized attention whatever their diagnosis, he wrote in the journal Pediatrics.

    Subsequent increases in the number of autism cases have varied widely by state but the average prevalence among 6- to 11-year-olds enrolled in special education programs increased from 0.6 per 1,000 pupils in 1994 to 3.1 per 1,000 in 2003.

    During the same period, diagnoses of mental retardation fell by 2.8 per 1,000 students and diagnoses of learning disabilities dropped by 8.3 per 1,000 students.

    Autism is a spectrum of disorders caused by abnormal brain development that can lead to diminished social skills, as well as unusual ways of learning and reactions to sensations. As many as 6 in 1,000 children are ultimately diagnosed with it to some degree, according to the Autism Society of America.

    Shattuck's analysis was challenged in an accompanying commentary by autism researcher Craig Newschaffer of Johns Hopkins Bloomberg School of Public Health in Baltimore.

    "We do not know whether individual children have switched classifications, and of course we can never know whether a given child in a particular birth cohort would have been classified differently had they been born either earlier or later. At best, analyses of this type are merely trying to determine if trends in one classification have the potential to offset those in another," he wrote.

    There was a clear need for definitive studies into the roles played by genetic susceptibility and environmental triggers in autism, Newschaffer wrote.

  2. #2

    Re: Rise in autism cases may not be real

    Children classified by U.S. school special education programs as mentally retarded or learning disabled have declined in tandem with the rise in autism cases between 1994 and 2003, the author of the study said, suggesting a switch of diagnoses.
    That is REALLY interesting.

    So I have a question and I'm not quite sure how to phrase it, but was the course of treatment different for the previous diagnosis? I guess I'm trying to ask if the approach changed with the (potential) diagnosis switch or if the approach is as it always has been. It seems like there are many different services/programs now for autistic individuals like Occupational Therapy, early intervention, etc. Were they previously serving those (potentially) differently diagnosed kids before (like before the age of 5)? And as the article mentions, the whole spectrum, the PDD-NOS diagnosis .... seems like it would further support the plausibility of this article.
    Autism Spectrum Disorder (ASD) is an increasingly popular term that refers to a broad definition of autism including the classical form of the disorder as well as closely related disabilities that share many of the core characteristics. ASD includes the following diagnoses and classifications: (1) Pervasive Developmental Disorder—Not Otherwise Specified (PDD-NOS), which refers to a collection of features that resemble autism but may not be as severe or extensive;
    I just added that quote in just for clarification of what I was talking about.

    Very for thought.

    The other thing I was wondering was if there were enough autistic adults that would support this theory? It seems like there are more children with autism than adults, but I don't know if that is really the case...I wonder how it compares statistically. Or maybe the adults are still misdiagnosed?
    Interesting things to think about.

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