Assessment of Dementia Knowledge Scale for the Nursing Profession and the General Population: Cross-Cultural Adaptation and Psychometric Validation

Background: The incidence of dementia is increasing dramatically worldwide. It is important to determine knowledge about the dementia for it's prevention, early diagnosis, treatment, and care. The psychometric properties of the Turkish version of the Dementia Knowledge Assessment Scale (DKAS-T) were evaluated in this study.

Methods: The psychometric study was conducted. A total of 1592 participants were recruited between November 2019 and March 2020. The data were collected using a sociodemographic form and DKAS-T. The language and content validity, exploratory factor analysis (EFA), and confirmatory factor analysis (CFA) were used to assess the validity of the scale. The scale's reliability was obtained using Cronbach's alpha coefficient, a paired sample t-test, item-total score correlation, and Hotelling's T-squared test.

Results: The mean age of the sample was 29.38 (±11.50) years; 66.8% (n = 1064) were female, and 54.1% (n = 861) reported their income status as income equal to expenditure. The DKAS-T demonstrated content validity and adequate sensitivity (Kendall W = 0.155, p = 0.093). The scale consisted of seventeen items and was unidimensional, which explained 28.705% of the variance. All the factor loadings were found to be >0.30 in factor analysis. In CFA, all of the fit indexes were >0.95 and root mean square error of approximation (RMSEA) was 0.033. A Cronbach's alpha value of 0.836 was obtained for the entire scale. It was determined that the scale has invariance according to time (t = -1.362, p = 0.181). Homogeneity of the scale was 3.26%, and there was no absence of reaction bias (Hotelling's T-squared = 2573.681, p < 0.001).

Conclusion: The results demonstrated that the instrument is reliable and generates valid data for the Turkish sample. This scale can be used to determine knowledge about dementia and planning educational interventions in the issue.