originally posted in:Psykana Librarius
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http://www.huffingtonpost.com/2014/03/27/autism-rate-1-in-68_n_5041858.html
Diagnosis effect - The amount of people who have autism now is proportional to the amount of people who had autism in the past. There isn't an actual increase or decrease in people who have autism, the only thing that is changing are the amount of diagnoses due to the advancing medical industry.
Human nurture - With the rapidly evolving medical industry, there are more and more treatments and procedures that babies are going through that may be affecting neural developmental health. The deteriorating air quality is also a factor that has been proven to be harmful for babies in and outside the womb. These, including many other environmental reasons, are increasing the amount of people who develop autism.
It's important to keep in mind that the increase in autism rates vary greatly on location, with the United States having both the highest rates of autism, and the fasting rising rates of autism.
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Also I think you should add to "diagnosis increasing" the fact that what is classed as autism is changing. 10 years ago autism was just one condition you had to varying degrees. Now it's a spectrum of about 20 different personality traits with autism at one end and Aspergers at the other, with normality in the middle. So all the people who where diagnosed as having one disorder before now fall under the autistic diagnosis. Literally everyone will score as partially autistic on at least 1 of the traits. As such, there are many people out there classed as having "high functioning autism". They can go about their lives like normal people but still get the autism diagnosis.