School Achievement Strongly Predicts Midlife IQ

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School Achievement Strongly Predicts Midlife IQ

• Ruth Spinks, Stephen Arndt, Kristin Capers,
  Rebecca Yucuis, William McKirgan, Chris Pfalzgraf
  and Elijah Waterman
• University of Iowa Carver College of Medicine

By. Mark Bauch
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Theory

• Elementary achievement is correlated with midlife
  IQ

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Hypothesis

• There will be a correlation between early school
  achievement and midlife IQ scores.

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Theoretical Construct 1

• Early School Achievement
• -Operational Definition
• -Iowa Test of Basic Skills (ITBS)
• -Grades 3-8 were tested
• -Tests Language and Mathematics

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Theoretical Construct 2

• Intelligence Testing for Mid Life IQ
• Operational Definition
• -Wechsler Adult Intelligence Scale, 3rd ed.
  (WAIS-III, Wechsler, 1997)
• -Measures IQ
• -Individually Administered by a trained research
  assistant

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Design

• Study and Subjects
• 219 Participants who were members of the Iowa
  Adoption Studies
• Both IQ and school achievement data were
  available

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• Independent Variable
• School Achievement
• Dependent Variable
• IQ performance

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Results

• School Achievement scores were highly correlated
  with WAIS-III FSIQ, sharing 41 of their
  variance.
• Verbal IQ shared more variance with school
  achievement(50) than performance IQ(14).

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Results cont.

• As expected, higher school achievement scores
  were associated with more years of education,
  higher income, and higher occupational status.

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More Results

• When computing partial correlations between
  school achievement and mid life education.
  (controlling for Full Scale IQ)
• School achievement and educational level was
  reduced by half (r 0.17, plt0.05, table 3).

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Questions

• Any Questions Class