1. 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

2. Theory
Elementary achievement is correlated with midlife IQ

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

4. Theoretical Construct 1
Early School Achievement
-Operational Definition
-Iowa Test of Basic Skills (ITBS)
-Grades 3-8 were tested
-Tests Language and Mathematics

5. 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

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

7. Independent Variable
School Achievement
Dependent Variable
IQ performance

8. 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%).

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

10. 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, p<0.05, table 3).

11. Questions
Any Questions Class