Validation of the Adapted German Versions of the Dementia Knowledge Assessment Tool 2, the Dementia Attitude Scale, and the Confidence in Dementia Scale for the General Population

Abstract

Background: There are almost no validated tools in German that assess dementia knowledge, attitude toward dementia, and confidence in the general population. Objective: Translation and validation of the German version of the Dementia Knowledge Assessment Tool 2 (DKAT2), the Dementia Attitude Scale (DAS), and the Confidence in Dementia Scale (CODE). Methods: Instruments were translated into German and adapted for the general public. A convenience sample of 263 persons was recruited via an online platform. Validation of the tools’ psychometric properties consisted of an assessment of its reliability (internal consistency and 4-week test-retest reliability of a subgroup with n = 110), an analysis of its construct validity through principal component analysis and known-group analysis, convergent validity, and an item analysis for DKAT2-D. This study used the STROBE checklist for reporting. Results: Acceptable to excellent internal reliability was found for DAS-D (α= 0.90), DKAT2-D (α= 0.78), and CODE-D (α= 0.93). The principal component analysis confirmed the two-factor model for the DAS-D as well as the one-factor solution for CODE-D. The intra-class correlation coefficient between the first and the 4-week retest was good (CODE-D: 0.897; 0.849–0.929) to excellent (DKAT2-D: 0.918; 0.879–0.945 and DAS-D: 0.940; 0.910–0.960). Known-group analysis revealed that DAS-D, DKAT-D, and CODE-D could distinguish between individuals with or without experience with people with dementia and with or without participation in a dementia course. Conclusion: The German versions DAS-D, DKAT2-D, and CODE-D are reliable and valid tools to measure knowledge, attitude, and confidence in dementia in the German-speaking general population.