E-ISSN : 2733-4538
The purpose of this study was to examine the potential effects of education on the Korean Wechsler Memory Scale, Fourth Edition (K-WMS-IV). The subtest scaled scores and index scores of education groups were compared, and the base rate and multi-variate base rate were produced for clinical utility. The interaction effect of age and education on the K-WMS-IV was also analyzed. The main results were as follows. First, the subtest scores and index scores were different depending on the levels of education. Index scores of the lowest education group (≤ 8) were 90.69-92.49, while those of the highest education group were 104.58-106.10 (≥16). Second, the base rate-i.e., percentage of cases below the cut-off score of M-1SD- of each index score tended to increase as years of education decreased. The base rates of the lowest education group were 19.77-30.23%, while those of the highest education group were 5.23-8.14%. In addition, the multi-variate base rate increased as the levels of education decreased. In the lowest education group, 55% of the lowest education group had one or more low index scores below the cut-off score (≤M-1SD), while 18% of the highest education group had one or more low scores. Lastly, the impact of education on memory performance increased as subjects got older. These results suggest that the K-WMS-IV would overestimate cognitive impairment in subjects with less education, while underestimate cognitive impairment in those with more education, especially in the older population.
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