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More on Autism Diagnosis

Eos of the Eons

Mad Scientist
Joined
Jul 23, 2003
Messages
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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?
 
Doing study on this next week - I shall raise your question, Eos! :)
 
Right, typing this post haste from the new medical library (Ooooooh!! It's lovely!! This is the first time I've been in a PROPER medical library and it's all gone to my head, just ask my husband when I raced home and pronounced that I'd diagnosed myself with obsessive compulsive disorder after just one reading of the DMV IV!!!! :D Yeah, such a skeptic am I..... :rolleyes:)

Okay, Eos:

DMV IV - when I have more time, I bet the DMV V could be found online with a nice link; one of the other students doing the unit I'm doing said it existed but I left my notebook in the classroom. Sorry, on lunch break. :)

Page 73 of the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision (DSM IV TR).

"Prevalance - the median rate of Autistic Disorder in epidemiological studies is 5 cases per 10,000 individuals, with reported rates ranging from 2 to 20 cases per 10,000 individuals. It remains unclear whether the higher reported rates reflect differences in methodology or an increased frequency of the condition."

Additional info you may like....
My lecturer, who is a Special Needs consultant for the West Australian Catholic Education Office and has autism as her focus of her PhD, says that 'rates of reported autism has increased 600% whereas across cultures worldwide rates of immunisation has declined." Therefore causal links between the two are, to her, 'nonsensical'. But we agree that a lot of rubbish is believed by people sometimes (ahem, like me getting a hold of the DMV and getting convinced I have .... never mind..... ;) )

She believes that some brain trauma during the early months of childhood may contribute to autism... she has one case she discussed in class where a child nearly drowned at a young age and she suspects this may be a contributing factor. The DMV IV says that "the condition is sometimes observed in association with neurological or other general medical conditions such as fragile X syndrome, tuberous sclerosis" (page 72).

"Various nonspecific neurological symptoms or signs may be noted in AD; ..... there are group differences in some measures of serotonergic activity but these are not diagnostic for AD. Imaging studies may be abnormal in some cases but no specific patter has been clearly identified. EEG abnormalities are common even the absence of seizure disorders." (again, page 72 of the DMV IV).

She also adds that she considers that there are 'probably' some genetic succeptibility involved with those people who have a reaction to immunisation, but would naturally suggest further research on this be done. :)
 
Kiless said:
DMV IV - when I have more time, I bet the DSM V could be found online with a nice link; one of the other students doing the unit I'm doing said it existed but I left my notebook in the classroom.

Okay - found this http://dsmivtr.org/2-1faqs.cfm if you want more on what the DSM (Bloody hell, I spelt it WRONG in my previous post - what an ASS am I, just shoot me and call me the most unscientific person on the planet, sorry everyone!!!! :( :( ) is but the fellow in my class also suggested this site, Eos - http://www.merck.com/mmhe/index.html

And yes, I am hanging my head in utter abject shame, sorry to all medicos, et al, out there. :( :(

I guess at least you can take refuge in knowing that both mental health and the state of your car is in good hands..... :rolleyes:
 
Eos of the Eons,

If you are trying to track historical autism rates, I think it is almost hopeless.

I remember seeing a graph with two lines. The first tracked changes in autism rate. It was going steadily up. The second line tracked "uncategorized retardation" (or something to that effect.) It went steadily up. If you added the two lines, it was pretty much flat. If my memory serves me right, the state was California and the autism rate doubled in a decade solely because of redefinition.

Since I assume the definitions changed at different times in different areas, it would be extremely difficult to do proper comparisons.

CBL
 
My tired eyes and brain are not registering much right now, so will read more tomorrow. Just wanted to say thanks for the information!
 

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