Estimating WAIS-R FSIQ from the national adult reading test-revised in normal subjects

Abstract

Abstract Examined the accuracy of the North American revision of the National Adult Reading Test (NART-R; Blair & Spreen, 1989) in predicting current WAIS-R FSIQ scores in a sample of 302 healthy job applicants. Also wished to establish adult norms for the NART-R according to age, education, and level of intelligence. Finally, also compared the accuracy of the NART-R in predicting WAIS-R FSIQ scores with that of the Reading Subtest of the Wide Range Achievement Test-Revised. Using the prediction equations developed by Blair and Spreen, estimated and obtained mean WAIS-R FSIQs were found to be nearly identical for the group as a whole, with r = .46 (p < 001). However, WAIS-R FSIQ was overestimated by NART-R performance among lower IQ groups, and underestimated among higher IQ groups. The WRAT-R Reading Score correlation with WAIS-R FSIQ was r = .45 (p < .001); the Reading Score also underestimated among higher IQ groups. Using the NART-R, 95% of the subjects had less than 15-point estimated-obtained IQ differences, supporting this cutoff as a potentially useful indicator of deterioration.