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The meaning of IQ constancy in young retarded children

J F Goodman, J Cameron

    The Journal of Genetic Psychology
    |March 1, 1978
    PubMed

    Insights

    Children with developmental delays show higher IQ test-retest correlations than typically developing peers. IQ stability varies by age at testing, with younger children and those in lower IQ ranges exhibiting more fluctuation.

    Area of Science:

    • Child Psychology
    • Developmental Neuroscience
    • Educational Psychology

    Background:

    • Understanding intellectual development in children with suspected developmental delay is crucial.
    • Assessing the stability of IQ scores in this population informs developmental trajectories and educational planning.

    Purpose of the Study:

    • To investigate the IQ constancy of children suspected of developmental delay.
    • To examine factors influencing IQ score fluctuations in this clinical population.

    Main Methods:

    • Repeated administrations of the Bayley Scales of Infant and Toddler Development and/or Stanford-Binet Intelligence Scales.
    • Analysis of IQ score correlations and changes in relation to age at testing, sex, and IQ level.

    Main Results:

    • Higher IQ test-retest correlations were observed in children with developmental delays compared to normal children.
    • IQ score magnitude of correlations was inversely related to IQ level.
    • Children tested under two years showed more IQ change; girls were more likely to show a drop; greatest fluctuation occurred in the 51-80 IQ range.

    Conclusions:

    • Children with developmental delays may mature intellectually at a rate proportional to their mental age, suggesting a prolonged learning period.
    • Educational programs should accommodate this extended maturation phase for children with developmental delays.

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