title: A comparison of the age-MLU relation in normal and specifically language-impaired preschool children.
abstract: The relation between age and mean length of utterance in morphemes (MLU) was evaluated in a sample of 48 preschool children between 24 and 50 months of age. Twenty-four of these children were diagnosed as having a specific language impairment, and 24 were considered language normal. The groups were matched on age, race, sex, and parental education level. A majority of the children in each group were from lower-middle-class backgrounds. MLU was derived from 20-min mother-child conversations as the dyad engaged in free play. The results showed that (a) age and MLU were significantly correlated in the normal group (r = .75) and in the group of specifically language-impaired children (r = .77), (b) the predicted MLU of the language-impaired group was lower than that of the normal group across the age range, and (c) the rate of MLU change in each group was similar. The age-MLU relation observed in the lower-middle-class normal children compared favorably to that reported previously for middle- to upper-middle-class children (Miller & Chapman, 1981). The finding that MLU changed at a similar rate in the normal and language-impaired groups is evaluated in light of the observation that childhood language disability is usually associated with slower rates of language development.
authors.affiliation: Vanderbilt University School of Medicine, Nashville, TN.
authors.forename: T
authors.initials: T
authors.lastname: Klee
authors.forename: M
authors.initials: M
authors.lastname: Schaffer
authors.forename: S
authors.initials: S
authors.lastname: May
authors.forename: I
authors.initials: I
authors.lastname: Membrino
authors.forename: K
authors.initials: K
authors.lastname: Mougey
mesh_terms: D000367:Age Factors; D002675:Child, Preschool; D004493:Education; D005260:Female; D006801:Humans; D007806:Language Disorders / Q000175:diagnosis; D008297:Male; D010699:Phonation; D012044:Regression Analysis; D012923:Social Class; D012959:Socioeconomic Factors; D014831:Voice