How common is developmental regression in autism spectrum disorder (ASD)?

Updated: Sep 30, 2019
  • Author: James Robert Brasic, MD, MPH; Chief Editor: Caroly Pataki, MD  more...
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Answer

Between 13% and 48% of people with autism have apparently normal development until age 15-30 months, when they lose verbal and nonverbal communication skills. These individuals may have an innate vulnerability to develop autism. Although regression may be precipitated by an environmental event (eg, immune or toxic exposures), more likely it is coincidental with other environmental events.


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