Researchers compared two groups of children initially diagnosed with autism spectrum disorder (ASD) between 2003 and 2012 at a university-affiliated developmental center in the Bronx: those born before 2005, a pivotal year because children born then would have been 24 months old when the AAP recommendation was issued, and those born in 2005 or later. They found the average age of diagnosis for those born before 2005 was just under four years old; for those born during or after 2005, it was roughly two-and-a-half years old.
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