Three Metrics of Early Identification of Autism Spectrum Disorder (ASD) by Presence of Co-occurring Intellectual Disability (ID)
Note: Limited to sites with IQ data in Autism and Developmental Disabilities Monitoring Network surveillance reports from 2002–2016; excludes children with unknown ID case status. The first panel shows the median among identified children, which is the age in months at which 50% of children with recorded ASD diagnosis or special education eligibility were identified. The second panel shows the median including unidentified children, which is the age in months at which 50% of children with and without recorded ASD were identified. The third panel shows cumulative incidence of ASD identified by age 48 months per 1,000 children.