title: Prevalence of pervasive developmental disorder in Down's syndrome.
abstract: The frequencies of pervasive developmental disorder (PDD) in Down's syndrome (DS) have been reported from 1% to 11%. However, it is not clear if the frequency of this co-occurrence is higher or lower than in other mental retardations. We study a large sample of DS population, finding a PDD frequency of 15.6%, with 5.58% of autism (eight males and two females) and 10.05% of PDD non autism (nine males and nine females. The meaning of this frequency is discussed.
authors.forename: Rosane
authors.initials: R
authors.lastname: Lowenthal
authors.forename: Cristiane S
authors.initials: CS
authors.lastname: Paula
authors.forename: Jose S
authors.initials: JS
authors.lastname: Schwartzman
authors.forename: Décio
authors.initials: D
authors.lastname: Brunoni
authors.forename: Marcos Tomanik
authors.initials: MT
authors.lastname: Mercadante
mesh_terms: D000328:Adult; D002648:Child; D002659:Child Development Disorders, Pervasive / Q000453:epidemiology*; D004314:Down Syndrome / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D015995:Prevalence