Dement Neurocogn Disord.  2021 Oct;20(4):62-69. 10.12779/dnd.2021.20.4.62.

A Comparison of the Performance between the 60- and 120-Second Conditions of the Korean-Color Word Stroop Test: Color Reading (K-CWST: CR)

Affiliations
  • 1Department of Neurology, Ewha Womans University Seoul Hopital, Seoul, Korea
  • 2Department of Psychology, College of Social Sciences, Hallym University, Chuncheon, Korea
  • 3Department of Neurology, Hallym University Sacred Heart Hospital, Anyang, Korea
  • 4Department of Neurology, Hallym University Sacred Heart Hospital, Chuncheon, Korea
  • 5Department of Neurology, Ewha Womans University Mokdong Hopital, Seoul, Korea

Abstract

Background and Purpose
The Korean-Color Word Stroop Test: Color Reading (K-CWST: CR) included in the Seoul Neuropsychological Screening Battery, 2nd Edition (SNSB-II) examines inhibitory control deficit. It provides normative data for both 60- and 120-second conditions, but the validity of the 60-second condition has not yet been proven. This study examined the validity of the 60-second condition by observing concordance between the performances in cognitively normal, MCI, and mild dementia groups.
Methods
There were 1,336 patients performed the SNSB-II, including the K-CWST: CR. Based on the cognitive test results, activities of daily living, and clinical interview, the patients were assigned to normal cognition (n=104), MCI (n=884), or mild dementia (n=348) groups. Abnormal performance on the K-CWST: CR was operationally defined as 1SD below the normative mean. The receiver operating characteristic curve analyses were conducted to compare the discriminability between the 60- and 120-second conditions.
Results
The percentages of abnormal performance in the MCI group were 41.5% and 42.3%, and those in the mild dementia group were 82.7% and 82.4% for the 60- and 120-second conditions, respectively. The areas under the curve for the 60- and 120-seconds were as follows; 0.80 and 0.81 in differentiating normal from MCI; 0.95 and 0.96 in normal from mild dementia; and 0.77 and 0.77 in MCI from mild dementia.
Conclusions
The 60-second condition of the K-CWST showed very similar results, not statistically different from the 120-second condition. Therefore, the 60-second condition could be used interchangeably with the 120-second condition in a clinical setting.

Keyword

Stroop Test; Mild Cognitive Impairment; Dementia
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