Brief report: Estimated prevalence of a community diagnosis of autism spectrum disorder by age 4 years in children from selected areas in the United States in 2010: Evaluation of birth cohort effects

Gnakub N. Soke, M. J. Maenner, D. Christensen, M. Kurzius-Spencer, L. A. Schieve

Research output: Contribution to journalArticle

5 Scopus citations


We compared early-diagnosed autism spectrum disorder (ASD) (defined as diagnosis by age 4 years) between the 2002 and 2006 birth cohorts, in five sites of the Autism and Developmental Disabilities Monitoring Network. In the 2002 cohort, the prevalence/1000 of earlydiagnosed ASD was half the 8-year-old prevalence (7.2 vs. 14.7, prevalence ratio [PR] 0.5 [0.4-0.6]). Overall, the prevalence of early-diagnosed ASD did not differ between birth cohorts (PR 1.1 [0.9-1.3]). However, in three sites with complete case ascertainment, the prevalence of earlydiagnosed ASD was higher for those born in 2006 versus 2002 (PR 1.3 [1.1-1.5]), suggesting possible improvement in early identification. The lack of change in two sites may reflect less complete case ascertainment. Studies in more recent cohorts are needed.

Original languageEnglish (US)
Pages (from-to)1917-1922
Number of pages6
JournalJournal of Autism and Developmental Disorders
Issue number6
StatePublished - Jun 1 2017



  • Autism
  • Autism spectrum disorder
  • Birth cohort effects
  • Community diagnosis
  • Prevalence

ASJC Scopus subject areas

  • Developmental and Educational Psychology

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