MacArthur Communicative Development Inventory

Receptive Vocabulary of Infants and Toddlers who are deaf or hard of hearing:

In a study of 168 infants and toddlers with significant hearing loss (73% were early-identified (Mayne, Yoshinaga-Itano, Sedey & Carey, 2000), only symbolic play predicted the number of words understood. Demographic variables, age of identification, degree of hearing loss, mode of communication, gender, maternal level of education, age of the child, Medicaid status, ethnicity, and presence of additional disabilities did not predict the number of words understood in this population. The first is the distribution for the total population and the second is the distribution for children with symbolic play quotients 80 or greater.
Insert figures from Mayne study about here
Colorado norms for the CDI number of different words understood are available for 49 children 8 to 12 months, 69 children 13 to 18 months, 108 children 19 to 24 months and 124 children 25 to 30 months. The distribution of scores from the 10th, 25th, 50th, 75th and 90th percentiles are depicted in the following figure. These figures are not adjusted for cognitive status or age of identification of hearing loss.

Productive Vocabulary size of children who are deaf or hard of hearing of hearing parents.

Fifty-six percent of the variance in expressive vocabulary scores of 113 children between the ages of 24- to -37 month old children was predicted. Thirty percent was predicted by the cognitive quotient (Situation Comprehension subtest of the Minnesota Child Development Inventory. Twenty-three percent of the variance was predicted by the age of identification and three percent of the variance was predicted by the presence of an additional disability.
From a sample of 368 deaf and hard-of-hearing infants and toddlers, the vocabulary development at specific age levels has been studied using the CDI Words Produced (Mayne, et al., 2000a, 2000b). The distribution of number of words produced at 10 age levels is depicted in five figures, 1) one for the total population of children with hearing loss, 2) one for early-identified children with hearing loss only between and 37 months, 3) one for later-identified children with hearing loss only, 4) one for early-identified children with additional disabilities and 5) one for later-identified children with additional disabilities.

Degree of hearing loss, mode of communication, maternal level of education, medicaid status, gender, ethnicity or age of the child at testing did not significantly influence the language outcomes of the children in the series of studies conducted in Colorado

ADDITIONAL LINKS

MacArthur Communicative Development Inventory: Words and Gestures

Sample MacArthur Report For Parents