Concurrent validity of The Kaufman Brief Intelligence Test (K-BIT) with the Wechsler Intelligence Scale for Children-Third Edition (WISC-III) was evaluated, as well as the K-BIT's accuracy as a predictor of WISC-III scores, in a sample of young children with reading disabilities. The two measures were administered to 65 children from Atlanta, Boston, and Toronto who ranged from 6-5 to 7-11 years of age at testing. Correlations between the verbal, nonverbal, and composite scales of the K-BIT and WISC-III were .60, .48, and .63, respectively. Mean K-BIT scores ranged from 1.2 to 5.0 points higher than the corresponding WISC-III scores. Standard errors of estimation ranged from 10.0 to 12.3 points. In individual cases, K-BIT scores can underestimate or overestimate WISC-III scores by as much as 25 points. Results suggest caution against using the K-BIT exclusively for placement and diagnostic purposes with young children with reading disabilities if IQ scores are required.
Chin, C.E., Ledesma, H.M.L., Cirino, P.T., Sevcik, R.A., Morris, R.D., Frijters, J.C. & Lovett, M.W. (2001). Relations between the Kaufman Brief Intelligence Test (KBIT) and the Wechsler Intelligence Scale for Children - Third edition (WISC-III) in Children with Reading Disability. Journal of Learning Disabilityies, 34(1), 2-8.