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More children are
being diagnosed with autism than in the past, according to
a new study of 289,456 children between the ages of 3 and
10 years in Atlanta.
Autism, characterized
by social isolation, difficulty communicating, repetitive
behaviors and delayed and unusual speech, affected 34 out
of every 10,000 children in the study.
This rate, though
consistent with those of recent studies, was higher than rates
found in earlier studies conducted in the 1980s and early
1990s. Only four similar studies have been conducted in the
United States to date. Three earlier studies found that about
four per 10,000 children had autism, while a study in 1998
found that 40 per 10,000 children have autistic disorder with
the number increasing to 67 per 10,000 if all types of autism-like
behavior are included.
According to researchers,
there is a greater public awareness of the disorder and the
symptoms associated with it, which may be one contributing
factor to the increased rates of autism. Another reason may
be the addition of autism as a condition for special education
services.
However, researchers
remain uncertain of whether environmental, immunologic, genetic
or other factors are contributing to the increased rates of
autism.
JAMA
January 1, 2003;289:49-55
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