01-08-2007 | Letter to Editor | Uitgave 7/2007
Prevalence of Pervasive Developmental Disorder in Down’s Syndrome
- Tijdschrift:
-
Journal of Autism and Developmental Disorders
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Uitgave 7/2007
- Auteurs:
- Rosane Lowenthal, Cristiane S. Paula, Jose S. Schwartzman, Décio Brunoni, Marcos Tomanik Mercadante
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.