Understanding Behavior - Autism

Epidemiological Statistics

  • Current prevalence of ASD: 1 in 110
  • Prevalence Risk for Subsequent Siblings: 1 in 20
  • Male to Female Ratio: 
    •                                              1 out of every 54 boys has an autism spectrum disorder
                                           
                           1 out of every 252 girls has an autism spectrum disorder
                                                

  • Broad Spectrum: 4:1

  • Prototypical Autism: 2:1
  • High Functioning ASDs: 8-10:1

Median Age of Diagnosis: 4.5 - 5.5 years
  • Underprivileged populations: 7-8 years
  • 80% of parents express concern by 24 months
  • Some argue ASDs can be reliably diagnosed by 18-24 months

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