E-ISSN : 2733-4538
This study investigated the construct validity of WCST(Wisconsin Card Sorting Test), by using the statistical method 'factor analysis' of the 10 subcategories in WCST. The subjects were 53 chronic schizophrenic patients, who had been engaged in rehabilitation programs in rehabilitation ward of mental hospital or community mental health care center. And it studied the relations of the scores of WCST factors, KWIS subtests, and BPRS subscales, in order to identify the criterion-related validity of WCST. In the results of 'factor analysis' of the 10 subcategories in WCST, the 4 factors, the failure of concept formation, perseveration, learning ability, the difficulty of sustained attention, were extracted. The explanation percent of the failure of concept formation was 52.5%, and it was highest explanation percent among theirs. In the result of studying the ralations of the scores of WCST factors, KWIS subtests, and BPRS subscales, the first factor, the failure of concept formation was significantly negatively related to total I.Q, arithmetic scores, vocabulary scores, similarity scores, assembly scores of KWIS, and significantly positively related to the disorganization symptom scores of BPRS. And the second factor, perseveration was not related to any subtests of KWIS, and significantly positively related to the disorganization symptom scores of BPRS. The third factor, learning ability was significantly positively related to comprehensive scores of KWIS, and significantly negatively related to positive symptom and anxiety of BPRS. Finally the fourth factor, the difficulty of sustained attention was significantly positively related to comprehensive scores of KWIS unexpectedly, and significantly negatively related to similarity scores, block design scores of KWIS. The meaning of this study was first, the subjects were korean chronic schizophrenia, and second, it investigated the construct validity and the criterion-related validity of WCST.