Postdicting verbal IQ of elderly individuals.
We undertook a longitudinal crossvalidation of the Ryan and Paolo (1992) equation's ability to postdict Wechsler Adult Intelligence Scale-Revised (WAIS-R) Verbal IQ (VIQ) from National Adult Reading Test (NART) performance measured 5 years after VIQ scores were obtained, for a sample of 49 elderly normal individuals (mean age 71 years). Five-year interval postdiction accuracy agreed very well with the results of the original, concurrent study. Clinical utility is still limited, however, as VIQ must decline by 16.3 points for 95%-detection sensitivity. A new regression equation that utilizes a combination of NART errors and WAIS-R Vocabulary age-scaled scores (measured 3 years earlier) provided slightly better expected clinical sensitivity and accounted for 49% of the variance in VIQ scores.
Carswell
L M
LM
University of Victoria, BC, Canada.
Graves
R E
RE
Snow
W G
WG
Tierney
M C
MC
D000368:Aged / Q000523:psychology*; D005260:Female; D006801:Humans; D007361:Intelligence Tests / Q000592:standards*; D008137:Longitudinal Studies; D008297:Male; D011932:Reading; D012015:Reference Standards; D012044:Regression Analysis; D014888:Wechsler Scales