title: Autism and intellectual disability: a study of prevalence on a sample of the Italian population.
abstract: BACKGROUND
  In 1994, the American Association on Mental Retardation with the DSM-IV has come to a final definition of pervasive developmental disorders (PDD), in agreement with the ICD-10. Prevalence of PDD in the general population is 0.1-0.15% according to the DSM-IV. PDD are more frequent in people with severe intellectual disability (ID). There is a strict relationship between ID and autism: 40% of people with ID also present a PDD, on the other hand, nearly 70% of people with PDD also have ID. We believe that in Italy PDD are underestimated because there is no agreement about the classification system and diagnostic instruments.
  
  
  METHODS
  Our aim is to assess the prevalence of PDD in the Italian population with ID. The Scale of Pervasive Developmental Disorder in Mentally Retarded Persons (PDD-MRS) seems to be a very good instrument for classifying and diagnosing PDD.
  
  
  RESULTS
  The application of the PDD-MRS and a clinical review of every individual case on a sample of 166 Italian people with ID raised the prevalence of PDD in this population from 7.8% to 39.2%.
  
  
  CONCLUSIONS
  The study confirms the relationship between ID and autism and suggests a new approach in the study of ID in order to elaborate a new integrated model for people with ID.
authors.affiliation: Psychiatry Unit, Department of Neurological and Psychiatric Sciences, University of Florence, Hospital of Careggi, Florence, Italy. gplamalfa@videosoft.it
authors.forename: G
authors.initials: G
authors.lastname: La Malfa
authors.forename: S
authors.initials: S
authors.lastname: Lassi
authors.forename: M
authors.initials: M
authors.lastname: Bertelli
authors.forename: R
authors.initials: R
authors.lastname: Salvini
authors.forename: G F
authors.initials: GF
authors.lastname: Placidi
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001321:Autistic Disorder / Q000175:diagnosis / Q000453:epidemiology*; D039721:Diagnostic and Statistical Manual of Mental Disorders; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000175:diagnosis / Q000453:epidemiology*; D007558:Italy / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D011795:Surveys and Questionnaires