Do normative data from the full WCST extend to the abbreviated WCST?

The standard Wisconsin Card Sorting Test (WCST) was administered to a mixed clinical sample of 332 individuals. The full version was compared to the 64-card version (WCST-64) by extracting the results of the first 64 cards. Percent scores for the WCST were converted to standard scores using the normative data corrected for age and education level. Percent scores for WCST-64 were converted to standard scores using the same WCST normative data. WCST-64 scores were not comparable to those obtained from the full WCST. A breakdown of the data based on performance level found WCST-64 to be useful only with respondents obtaining five or more categories by the end of the first deck. The authors recommend caution in applying WCST manual data to the WCST-64 in the clinical setting.