Relation between Kaufman Brief Intelligence Test and WISC-III scores of children with RD

Concurrent validity of the Kaufman Brief Intelligence Test (K-BIT) with the Wechsler Intelligence Scale for Children-Third Edition (WISC-III) was eval uated, as well as the K-BIT's accuracy as a predictor of WISC-III scores, i n a sample of young children with reading disabilities. The two measures we re 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, a nd .63, respectively. Mean K-BIT scores ranged from 1.2 to 5.0 points highe r than the corresponding WISC-III scores. Standard errors of estimation ran ged from 10.0 to 12.3 points. In individual cases, K-BIT scores can underes timate or overestimate WISC-III scores by as much as 25 points. Results sug gest caution against using the K-BIT exclusively for placement and diagnost ic purposes with young children with reading disabilities if IQ scores are required.