Comparative Test-Retest Stability of Four WAIS-R Selected Subtest Short Forms in Persons 75 to 87 Years of Age
We compared the retest stability of selected WAIS-R short forms including the Kaufman, Ishikuma, & Kaufman-Packer; Reynolds, Wilson, and Clark; and Silverstein tetrads; and the Ward seven subtest abbreviation. Subjects were 61 normals with means for age and education of 78.93 years ( SD = 3.46) and 9.74 years ( SD = 1.91), respectively. The average retest interval was 65 days. Stability coefficients were .87, .94, and .89 for the Kaufman, Reynolds, and Silverstein tetrads, respectively. Coefficients on Ward's abbreviation were .88 on the Verbal, .91 on the Performance, and .93 on the Full Scales. Retest means changed by 3.03 points on Kaufman, -.38 on Reynolds, and .56 on Silverstein. Average changes were 2.36, 3.49, and 3.36 on the Ward Verbal, Performance, and Full Scale estimates. Short form stability in each instance was comparable to that of the standard WAIS-R.