Gender, Race, and Education Differences on the K-Bit at Ages 4 to 90 Years

Data from the K-BIT standardization sample (2,022 individuals aged 4 to 90 years) were used to explore gender, race, and education differences on the verbal, nonverbal, and IQComposite components of this brief intelligence test. ANOVAs were conducted to evaluate individual differences on these demographic variables for children, adolescents, and adults, and then ANCOVAs were performed to explore gender and race differences; educational attainment was covaried. Correlational analysis also was used to study the education-IQ relationship. Male-female differences tended to be negligible, while race and education produced large, significant differences. Educational attainment was related strongly to intelligence for Whites, Blacks, and Hispanics. A significant age x race interaction in the ANCOVA indicated that White Black and White-Hispanic differences were largest for adults and smallest for young children.