Cross-validation of an index of premorbid intellectual functioning in children.

Attempted to cross-validate the results of C. R. Reynolds and T. B. Gritbin's (1979) index of premorbid intellectual functioning in children. For a clinically relevant sample of 76 nonimpaired and 23 organically impaired children, WISC-R IQs predicted by the index correlated at only minimal and nonsignificant levels with actual IQs. The index's ability to discriminate between the 2 groups was similarly found to be extremely limited. (1 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)