Approximately 28.8% of young children with autism have less severe autism spectrum disorder (ASD) symptoms at age 6 than they did at age 3. When evaluated at age 3 and age 6, using a 10-point severity measure called the ADOS Calibrated Severity Score (CSS) derived from the Autism Diagnostic Observation Schedule (ADOS), children were classified into a Decreased Severity Group (a two or more points decrease at age 6 compared to age 3), a Stable Severity Group (zero or 1 point score change) and an Increased Severity Group (a two or more point increase at age 6 compared . . .
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