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Age Group

Figure 5.11

Mean "reference group" scaled scores on the Processing Speed subtests, plus Picture Arrangement, for adults ages 16-17 to 85-89 years, adjusted for education (values for ages 16-19 are unadjusted).

Source: Standardization data of the Wechsler Adult Intelligence Scale: Third Edition. Copyright © 1997 by The Psychological Corporation. Used by permission. All rights reserved. Reprinted from Kaufman (2000, Figure 3) with permission.

the observed pattern may not generalize to intelligence tests that are theory-based or otherwise do not conform to the Binet-Wechsler model of IQ tests. On the KAIT, for example, whose standardization data were obtained about 1990, Composite IQ peaked at age 22 (Kaufman & Kaufman, 1993, Table 8.6). KAIT Composite IQ is a blend of Fluid IQ and Crystallized IQ.

Cross-Sectional Investigations of Kaufman and Kaufman's Adult Tests

Kaufman and his colleagues conducted a series of studies to examine the patterns of education-corrected mean scores across the adult life span on the Kaufman Adolescent and Adult Intelligence Test (KAIT; Kaufman & Kaufman, 1993), Kaufman Brief Intelligence Test (K-BIT; Kaufman & Kaufman, 1990), Kaufman Functional Academic Skills Test (K-FAST; Kaufman & Kaufman, 1994a), and Kaufman Short Neuropsychological Assessment Procedure (K-SNAP; Kaufman & Kaufman, 1994b). Consult Chapter 13 for a thorough treatment of the KAIT and Chapter 15 for discussions of the K-BIT, K-FAST, and K-SNAP.

Kaufman and Horn's (1996) KAIT Investigation at Ages 17 to 94 Years

The KAIT standardization sample at ages 17-19 through to 75-94 years (N = 1,500) served as the data source for Kaufman and Horn's (1996) study

TABLE 5.9 "Peak" and "Weak" ages of performance on the 14 WAIS-III subtests, based on scaled scores adjusted for educational attainment
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