title: Postdicting verbal IQ of elderly individuals.
abstract: 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.
authors.affiliation: University of Victoria, BC, Canada.
authors.forename: L M
authors.initials: LM
authors.lastname: Carswell
authors.forename: R E
authors.initials: RE
authors.lastname: Graves
authors.forename: W G
authors.initials: WG
authors.lastname: Snow
authors.forename: M C
authors.initials: MC
authors.lastname: Tierney
mesh_terms: 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