In the first study, published in Pediatrics1, authors from the U.S. Department of Health and Human Services (HHS) and the Centers for Disease Control and Prevention (CDC) collected data through the National Survey of Children's Health (NSCH) on parent-reported diagnosis of ASD. Among a nationally representative sample of 78,000 children aged 3 to 17 years, the investigators found that 1 in 91, or an estimated 673,000 children in the U.S. had an ASD. While concerns lingered over the parent-reported nature of the data, this large-scale study set the stage for another major publication on ASD prevalence with similar results.