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definition
Autism is the most prevalent PDD (or Autism Spectrum
Disorder [ASD]). It is a developmental disorder characterized by impairments
in communication and socialization, and by restricted and repetitive
behavior. Recent estimates have placed occurrence of ASD at 1 in 150
children in certain communities (CDC, 2007). While the exact reasons
for a recent increase in prevalence for ASD related disorders, including
autism, are not known, there are indications that it is due at least
in part to improved identification of young children in need and to
the expansion of the ASD diagnosis to include a broader range of characteristics.
ASD prevalence is higher among boys than among girls, ranging from
three to more than five boys for every girl. ASD is not limited to
a particular racial, ethnic or social group. The specific causes are
not known, although they are related to brain function.
Autism is a spectrum disorder with skills and deficits varying
greatly from person to person. Behaviors characteristic of autism
and mental disability also occur across a continuum and may range
from mild to severe. People with autism exhibit individualized and
distinctive combinations of strengths and needs.
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Disabilities 
