WAIS-R Reliability and Standard Errors for Persons 75 to 79, 80 to 84, and 85 and Older

Ryan, Joseph J.; Paolo, Anthony M.; Brungardt, Terry M.

doi:10.1177/073428299000800102

Cited by 5 publications

(1 citation statement)

References 7 publications

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“…These results indicating decline in the latest period of human development are consistent with those found in the standardization sample of the WAIS-R, through ages 70-74 (Kaufman et al, 1989), and in the standardization of the WAIS-R for 226 elderly individuals ages 75 and above (Ryan & Paolo, in press;Ryan, Paolo, & Brungardt, 1990). In the results of the present study we find that the decline after age 75 years is substantial.…”

Section: Discussionsupporting

confidence: 84%

Age changes on tests of fluid and crystallized ability for women and men on the Kaufman Adolescent and Adult Intelligence Test (KAIT) at ages 17-94 years

Kaufman

Horn

1996

Archives of Clinical Neuropsychology

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Within a norm sample of 1,500 men and women, 17-94 years of age (13 age groupings), using Multivariate Analysis of Variance and Covariance, it was found that four measures designed to indicate fluid reasoning (Gf) and the composite measure of Gf declined steadily over the entire adulthood period, the decline accelerating during the period beginning at about age 55 years. Also, four measures of crystallized knowledge (Gc) and the composite measure of Gc increased through the 20s, neither increased nor decreased through mid-adulthood until about age 60 years, and declined thereafter. For the composite measures of Gf and Gc, there were no main effects or interaction effects associated with Gender. When educational attainment was covaried, small but statistically significant Gender main effects were found for four of the subtest measures of Gf and Gc; significant Gender x Age interaction effects were found for two subtests. Interpreted within Gf-Gc theory, the results replicate and extend evidence of the adulthood development of cognitive capabilities.

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Section: Discussionsupporting

confidence: 84%