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Expressive language disorder describes a condition in which an individual’s spoken language ability is markedly reduced in relation to language comprehension and mental age. According to the International Classification of Diseases, 10th Revision, expressive language disorder is defined as expressive language ability greater than 2 standard deviations below the norm for age (97.5% of individuals would obtain higher scores in expressive language) with receptive language ability (i.e., ability to understand language spoken by others) within 2 standard deviations of the norm for age. Such measurements may be a result of either inability to formulate language at an appropriate level for communication purposes and/or severe inability to produce recognizable speech.

The majority of affected children present as “late talkers” during their preschool years. Those with expressive language ...

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