An Australian validation of the Kaufman Brief Intelligence Test (K-BIT) with adolescents with an intellectual disability

The Kaufman Brief Intelligence Test (K-BIT; Kaufman & Kaufman, 1990) provid es a relatively quick assessment of intelligence. In this study we assessed the validity and reliability of the K-BIT with an Australian sample of ado lescents with an intellectual disability (N = 107). To examine criterion va lidity, K-BIT scores were correlated with scores on the Coloured Progressiv e Matrices (CPM; Raven, 1956; r=.52), and the Wechsler Intelligence Test fo r Children - Revised (WISC-R; Wechsler, 1974; r =.73-.75). Test-retest and split-hair reliability of the K-BIT were also examined (r =.93 and .88 resp ectively). Finally, item analyses examined the difficulty and discriminabil ity of individual items. The results revealed that the K-BIT composite scor e in general provides a valid and reliable estimate of intelligence for Aus tralian adolescents with an intellectual disability, but that a higher stan dard error estimate should be used in interpreting scores of the overall co mposite and Matrices scores of the K-BIT for students with an intellectual disability within the age range of 13 to 17 years.