POSTDICTING VERBAL IQ OF ELDERLY INDIVIDUALS

We undertook a longitudinal crossvalidation of the Ryan and Paolo (199 2) equation's ability to postdict Wechsler Adult Intelligence Scale-Re vised (WAIS-R) Verbal IQ (VIQ) from National Adult Reading Test (NART) performance measured 5 years after VIQ scores were obtained, for a sa mple of 49 elderly normal individuals (mean age 71 years). Five-year i nterval 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) provid ed slightly better expected clinical sensitivity and accounted for 49% of the variance in VIQ scores.