School achievement strongly predicts midlife IQ |
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| Authors: | Ruth Spinks Stephan Arndt Kristin Caspers Rebecca Yucuis L. William McKirgan Christopher Pfalzgraf Elijah Waterman |
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| Affiliation: | aIowa Adoption Studies, Department of Psychiatry, University of Iowa Carver College of Medicine, United States;bDepartment of Biostatistics, University of Iowa College of Public Health, United States;cIowa Consortium on Substance Abuse Research and Evaluation, University of Iowa, United States |
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| Abstract: | The relationship between measures of IQ and standardized school achievement tests is well established at around r ≈ 0.5 when the two are measured in close proximity. The current paper examined the stability of this correlation when comparing elementary school achievement (grades 3–8) and midlife IQ. Iowa Adoption Study participants who had standardized school achievement measures (ITBS) on file were given the WAIS-III. Mean age at IQ testing was 44.01 years (SD 6.65 years). The correlation between school achievement and WAIS-III FSIQ was r = 0.64, suggesting substantial life span stability in this relationship. Furthermore, elementary school achievement was substantially correlated with occupational status and household income at midlife. These findings suggest that standardized school achievement data is a useful measure of premorbid IQ. |
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| Keywords: | Intelligence School achievement Premorbid IQ |
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