The Dementia Knowledge Assessment Scale, the Knowledge in Dementia Scale, and the Dementia Knowledge Assessment Tool 2: Which Is the Best Tool to Measure Dementia Knowledge in Greece?

Marianna Tsatali; Ioanna Antigoni Angelidou; Magda Tsolaki; Birgit Teichmann

doi:10.3233/ADR-230161

The Dementia Knowledge Assessment Scale, the Knowledge in Dementia Scale, and the Dementia Knowledge Assessment Tool 2: Which Is the Best Tool to Measure Dementia Knowledge in Greece?

J Alzheimers Dis Rep. 2023 Dec 29;7(1):1377-1393. doi: 10.3233/ADR-230161. eCollection 2023.

Authors

Marianna Tsatali^{1

2

3}, Ioanna Antigoni Angelidou², Magda Tsolaki^{1

4}, Birgit Teichmann²

Affiliations

¹ Greek Association of Alzheimer's Disease and Related Disorders (GAADRD), Thessaloniki, Greece.
² Network Aging Research, Heidelberg University, Heidelberg, Germany.
³ Department of Psychology, School of Humanities and Social Sciences, University of Western Macedonia, Kozani, Greece.
⁴ Center for Interdisciplinary Research and Innovation, Laboratory of Neurodegenerative Diseases, Aristotle, University of Thessaloniki (CIRI-AUTh), Thessaloniki, Greece.

Abstract

Background: Measuring dementia knowledge can be a valuable tool for assessing the effectiveness of dementia awareness activities, identifying the potential benefits of dementia training programs, and breaking down common myths and stereotypes about dementia.

Objective: To compare the psychometric properties of three widely used dementia knowledge tools, the Dementia Knowledge Assessment Tool 2 (DKAT2-G), the Dementia Knowledge Assessment Scale (DKAS-G), and the Knowledge in Dementia Scale (KIDE-G) in the Greek adult population.

Methods: A convenience sample of 252 participants from the general population completed the survey online. Statistical analyses included Cronbach's internal reliability, retest reliability, factor analysis, concurrent and construct validity, and floor and ceiling effects.

Results: The DKAS-G had the most appropriate reliability levels (Cronbach's alpha = 0.845; retest reliability = 0.921), whereas the DKAT2-G had satisfactory indexes (Cronbach's α= 0.760; retest reliability = 0.630). The KIDE-G showed unsatisfactory reliability (Cronbach's α= 0.419; retest reliability = 0.619). Construct validity was confirmed for all questionnaires, showing that all of them detected participants with pre-existing knowledge of dementia. Confirmatory factor analysis revealed a four-factor model for the DKAS-G and proposed the removal of 5 items. Floor and ceiling effects were found for the DKAT2-G and the KIDE-G, mainly among those who had previously participated in dementia training.

Conclusions: The DKAS-G was found to have the highest levels of reliability and validity. The results prove that the DKAS-G meets the requirements for measuring dementia knowledge and evaluating dementia training programs in health professionals, caregivers, and the general population.

Keywords: Alzheimer’s disease; knowledge; reliability and validity; test-retest reliability; validation study.