Relationships among Wechsler Adult Intelligence Scale, Goodenough-Harris, and Peabody Picture Vocabulary Tests with Institutionalized Retarded Adults

Abstract

Test data for 150 adult institutionalized retardates were subjected to a two-factor analysis of variance with repeated measures (tests) on one factor. The matched male ( n = 32) and female ( n = 32) groups showed no sex differences but significant test differences. On the Goodenough-Harris Draw-A-Man, the Woman Point scale mean IQs were lower than the Man Point scale means. The Point scale means were significantly lower than the Quality scale means for all three drawings (Man, Woman, Self). Correlations of the Goodenough-Harris IQs with WAIS and PPVT IQs were lower for women than for men. The Goodenough-Harris IQ scores correlated better with the WAIS Performance scale IQ than with the Verbal scale IQ. PPVT IQs tended to fall between the WAIS Verbal and Performance scale IQs but correlated better with the Verbal scale than with the Performance scale. The PPVT, a vocabulary measure, was a somewhat better over-all predictor of the WAIS IQ than the Goodenough-Harris drawings.