Prevalence of ASD
The Autism and Developmental Disabilities Monitoring Network (ADDM Network) of Center for Disease and Control Prevention (CDC) has been tracking data on the prevalence of ASD among 8-year-olds in the U.S. population since 2000. This is the age by which most children would have a diagnosis according to previous works done by CDC. The data estimated the prevalence of ASD at 1 in 150 in 2000. By 2014, the estimation rose to 1 in 59. Boys are affected 4 times more than girls. This puts the affected rate of boys at 1 in 37 and girls at 1 in 151. These numbers do not include undiagnosed cases. Therefore, the actual number of children with ASD is very likely to be even higher. Researchers have not identified all causes of ASD but know that it may be due to the combination of genetic, biological and environmental factors. ASD occurs in all racial, ethnic and socioeconomic groups. Based on the numbers and information reported by the CDC, it is a reasonable expectation that all music teachers will encounter students with ASD in his/her music classes at some point.
 “Data & Statistics on Autism Spectrum Disorder,” Autism Spectrum Disorder (ASD), U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, last modified November 15, 2018. https://www.cdc.gov/ncbddd/autism/data.html.
 Centers for Disease Control and Prevention, “Data & Statistics on Autism Spectrum Disorder”; Jon Baio, Lisa Wiggins, Debra L. Christensen, et al., “Prevalence of Autism Spectrum Disorder Among Children Aged 8 Years — Autism and Developmental Disabilities Monitoring Network, 11 Sites, United States, 2014,” MMWR Surveillance Summaries 2018;67(No. SS-6):1–23, last modified November 15, 2018, DOI:/10.15585/mmwr.ss6706a1.
 Jon Baio, “Prevalence of Autism Spectrum Disorder Among Children Aged 8 Years.”