Chronological age and receptive vocabulary of persons with Down syndrome.

The Test de Vocabulaire en Images (the French version of the Peabody Picture Vocabulary Test) and the Columbia Mental Maturity Scale were administered to 29 participants with Down syndrome aged 6.1 yr. to 13.0 yr. Analysis indicated a significant association between chronological age and the Test de Vocabulaire en Images mental age. This finding seems to suggest that the relationship between chronological age and the receptive vocabulary of persons with mental retardation is not specific to etiology.