| http://www.w3.org/ns/prov#value | - Because of the high prevalence of co-occurring conditions, we also conducted analyses of both health and functional impact and health care utilization limited to children with an isolated DD (ie, those without a co-occurring DD), with the exception of autism, mental retardation, and other developmental delay, which were isolated in only 4.6%, 17.1%, and 23.9% of affected children, respectively.
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