It is estimated that for every 1000 three-year-old children, 31 will have some form of language disorder. Of these, 23 are severely impaired, that is, their language age is less than two-thirds their chronological age.
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- Tower DB (1979): The Neurological Bases of Language Disorders in Children: Methods and Directions for Research. NINCDS Monograph No. 22, U.S. DHEW, PHS, NIHGoogle Scholar