WISC-III subtest scatter as a function of highest subtest scaled score

The Wechsler Intelligence Scale for Children-III (WISC-III) standardization data were analyzed to determine the frequency of occurrence for relative intersubtest scatter ranges. The relative scatter range was defined as the difference between the highest and lowest subtest scaled scores based on the value of the highest subtest scaled score. This approach to intersubtest scatter provides the greatest precision in scatter analysis to help clinicians determine whether the amount of scatter obtained in WISC-III clinical profiles is rare enough to be considered abnormal. For ease of clinical use, tables are provided that report frequency of occurrence for the lowest subtest scaled score by each level of highest subtest scaled score. Potential scatter range, rather than overall level of intelligence, was the primary determinant of the magnitude of scatter; the greater the possible range, the larger the magnitude of scatter.