title: DSM-IV vs DSM-5 diagnostic criteria for toddlers with autism.
abstract: OBJECTIVE
  To evaluate prevalence rates of autism and autism symptomatology in toddlers using DSM-IV vs DSM-5 criteria.
  
  
  METHODS
  Two thousand seven hundred and twenty-one toddlers at risk for a developmental disability participated. DSM-IV and DSM-5 criteria were applied and overall prevalence using each set of criteria was established. Groups were also compared on BISCUIT-Part 1 scores to determine if groups differed on autism symptomatology.
  
  
  RESULTS
  DSM-5 resulted in 47.79% fewer toddlers being diagnosed with ASD compared to those on the DSM-IV. Toddlers diagnosed according to DSM-5 exhibited greater levels of autism symptomatology than those diagnosed with DSM-IV, but the latter group still exhibited significant levels of autism symptomatology.
  
  
  CONCLUSIONS
  The proposed DSM-5 will result in far fewer persons being diagnosed with ASD. These results replicate findings from two previous studies, with older children/adolescents and adults. As a result of these new criteria, far fewer people will qualify for needed autism services.
authors.affiliation: Department of Psychology, Louisiana State University, Baton Rouge, LA 70803, USA. johnmatson@aol.com
authors.forename: Johnny L
authors.initials: JL
authors.lastname: Matson
authors.forename: Alison M
authors.initials: AM
authors.lastname: Kozlowski
authors.forename: Megan A
authors.initials: MA
authors.lastname: Hattier
authors.forename: Max
authors.initials: M
authors.lastname: Horovitz
authors.forename: Megan
authors.initials: M
authors.lastname: Sipes
mesh_terms: D001321:Autistic Disorder / Q000175:diagnosis*; D002675:Child, Preschool; D039721:Diagnostic and Statistical Manual of Mental Disorders; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008403:Mass Screening / Q000379:methods