The 1-year temporal stability of the Wechsler Adult Intelligence Scale-Revised (WAIS-R) Full Scale IQ (FSIQ) and several predictors of intelligence, including the A. Barona and R. Chastain (1986) demographic predictor formula, the New Adult Reading Test-Revised (NART-R: J. Blair & O. Spreen, 1989), and the Intellectual Correlates Scale (ICS: R. Schlottmann & D. Johnsen, 1991 ) were investigated in 51 normal older persons. Reliability of WAIS-R FSIQs and Barona, NART-R, and ICS estimates of FSIQ fell at.90,.99,.92, and.58, respectively (all ps <.05 ). Estimates of FSIQ generated by the Barona, NART-R, and ICS correlated significantly with concurrent FSIQ obtained on the 1st (r =.61,.73, and.48, respectively) and 2nd observations (r =.63,.73, and.41, respectively). A simple average of Barona and NART-R estimates derived from the 2nd observation correlated at.75 with WAIS-R FSIQs obtained 1 year earlier.
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Raguet et al. (1996) studied this question.
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