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> Neither does autism. If there is an objective definition of autism, I am not aware of it. > Yes. I've been saying that all along. The increase in case numbe

> Neither does autism. If there is an objective definition of autism, I am not aware of it. > Yes. I've been saying that all along. The increase in case numbers - and the inferred conclusion that something environmental has changed to cause that - is an illusion. This has as little evidence to support it as the idea that autism increases are being caused by something environmental.

ceejayoz 1y ago
It's pretty clear in a chart. https://www.psu.edu/news/research/story/increasing-prevalence-autism-due-part-changing-diagnoses https://www.psu.edu/news/research/story/increasing-prevalenc... > They also found that the increase in students diagnosed with autism was offset by a nearly equal decrease in students diagnosed with other intellectual disabilities that often co-occur with autism. > The researchers conclude that the large increase in the prevalence of autism is likely the result of shifting patterns of diagnosis that are complicated by the variability of autism and its overlap with other related disorders. > Recent reports from the United States Centers for Disease Control and Prevention (CDC) suggest that there has been an increase in the prevalence of autism from 1 in 5,000 in 1975 to 1 in 150 in 2002, and to 1 in 68 in 2012. Much of this increase has been attributed to increased awareness and a broadening of the diagnostic criteria for autism. But this new research provides the first direct evidence that much of the increase may be attributable merely to a reclassification of individuals with related neurological disorders rather than to an actual increase in the rate of new cases of autism. > The diagnostic reclassification of individuals from the category of intellectual disability to the category of autism accounts for a large proportion of the change, which varied depending on the age of the children. The researchers estimate that, for 8 year-olds, approximately 59 percent of the observed increase in autism is accounted for by reclassification, but by age 15 reclassification accounts for as much as 97 percent of the increase in autism.

ceejayoz 1y ago

It's pretty clear in a chart. https://www.psu.edu/news/research/story/increasing-prevalence-autism-due-part-changing-diagnoses https://www.psu.edu/news/research/story/increasing-prevalenc... > They also found that the increase in students diagnosed with autism was offset by a nearly equal decrease in students diagnosed with other intellectual disabilities that often co-occur with autism. > The researchers conclude that the large increase in the prevalence of autism is likely the result of shifting patterns of diagnosis that are complicated by the variability of autism and its overlap with other related disorders. > Recent reports from the United States Centers for Disease Control and Prevention (CDC) suggest that there has been an increase in the prevalence of autism from 1 in 5,000 in 1975 to 1 in 150 in 2002, and to 1 in 68 in 2012. Much of this increase has been attributed to increased awareness and a broadening of the diagnostic criteria for autism. But this new research provides the first direct evidence that much of the increase may be attributable merely to a reclassification of individuals with related neurological disorders rather than to an actual increase in the rate of new cases of autism. > The diagnostic reclassification of individuals from the category of intellectual disability to the category of autism accounts for a large proportion of the change, which varied depending on the age of the children. The researchers estimate that, for 8 year-olds, approximately 59 percent of the observed increase in autism is accounted for by reclassification, but by age 15 reclassification accounts for as much as 97 percent of the increase in autism.