Comparison of the Peabody Picture Vocabulary Test-Third Edition and Wechsler Adult Intelligence Scale-Third Edition with university students

This study examined the relationship between the Peabody Picture Vocabulary Test-Third Edition (PPVT-III) and Wechsler Adult Intelligence Scale-Third Edition (WAIS-III) using 40 adults who ranged in age from 18 to 41 (mean ag e of 22 years). Participants were administered the PPVT-III and WAIS-III in counterbalanced fashion to control for order effects. Results revealed tha t the PPVT-III score was related to the WAIS-III Verbal IQ (VIQ) and Full S cale IQ (FSIQ) scores but unrelated to the Performance IQ (PIQ) score. In a ddition, analyses indicated that, while there were no significant differenc es between the PPVT-III score and WAIS-III mean FSIQ and PIQ scores, the PP VT-III mean score was significantly lower than the WAIS-III VIQ. Further an alysis indicated that the PPVT-III adequately estimated WAIS-III FSIQ and V IQ scores for participants who were classified as Average or High Average o n the WAIS-III. However, for participants in the Superior range, the PPVT-I II tended to underestimate FSIQ and VIQ scores by approximately 10 points. (C) 2001 John Wiley & Sons, inc.