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Test-Retest Stability of the Wisconsin Card Sorting Test

Eighty-seven normal older persons were administered the Wisconsin Card Sorting Test (WCST) on two occasions an average of 1.1 years apart. Means for age and education were 68.79 years (SD = 6.21) and 14.80 years (SD = 2.42), respectively. Stability coefficients ranged from .12 on the Learning to Learn scale to .66 for the Total Number of Errors scale. The majority of individuals improved on retest with five WCST scores demonstrating significant average retest gains of 5 to 7 standard score points. The standard error of prediction, standard error of difference, and abnormal test-retest discrepancy scores were calculated to assist clinicians in detecting possible meaningful changes in WCST scores on retest.