Eos of the Eons
Mad Scientist
- Joined
- Jul 23, 2003
- Messages
- 13,749
As has been shown, the USDE data on autism are at odds with studies of autism prevalence, largely because the criteria used by the school districts (the source of the USDE data) to categorize children as autistic are neither rigorous nor consistent. They are inconsistent over time, as are the medical criteria, and are inconsistent from region to region. The USDE data are not reliable for tracking the prevalence of autism, and they in fact never were meant to fill this need.
School criteria vs other means of tracking the prevalence of autism.
a certain degree of “autistic†behaviors can be expected in many “typical†individuals.19,20 This further complicates the diagnosis of autism, because there is no distinct “cutoff†point between typical and autistic. There are indications that the increasing awareness of autism in the medical and educational
communities may have led to a gradual shift in diagnosis
to include less disabled individuals who would not previously have been described as autistic13 or would have received a different diagnosis.5
I would doubt at this time there is a "definitive" number until the diagnostic criteria is more universal, so to speak. It doesn't seem as cut and dry the way the numbers for other disorders are.
So what is the most reliable source to use when quoting autism prevalence?