WISC-R factor structures of younger and older youth with low IQs.

Factor analyzed WISC-R scores from 107 9–11 yr old children (mean IQ 70.4) and 78 14–26 yr old children (mean IQ 66.5). Coefficients of congruence across groups indicated that the 2 age groups were similar on the Verbal Comprehension and Perceptual Organization factors, but less similar on the Freedom From Distractibility factor. (3 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)