The Minnesota Child Development Inventory

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Abstract
The concurrent validity and reliability of the Minnesota Child Development Inventory (MCDI) was assessed by comparing the MCDI general development index score, and each of the seven subscale scores, with the mental and psychomotor age equivalents achieved on the Bayley Scales of Infant Development. In addition, the co-positivity, co-negativity, positive and negative predictive values of the MCDI in identifying infants with a mental development index (MDI), or psychomotor development index (PDI) of greater than 2 SD below the mean were assessed. Subjects were 101 infants (8 to 19 months old) who were seen at a neonatal developmental follow-up clinic after discharge from the neonatal intensive care unit. Correlations were obtained for the entire sample as well as for the two chronological age groups (i.e., 8 to 10 months and 17 to 19 months) within the sample. A strong correlation between the MCDI scales and the Bayley Mental and Psychomotor Scales was documented for the entire population as well as for the individual age groups. The overall validity of the MCDI in identifying infants with a MDI or PDI of > 2 SD below the mean was limited due to relatively poor co-positivity and positive predictive value. Although the MCDI may yield consistent information about the development of an infant's skills, this research suggests the MCDI has limited capacity to discern infants having delayed development.

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