The Turkish adaptation of the D-SCOPE questionnaire (DESTEK) demonstrated acceptable validity and reliability for assessing Turkish dietitians' knowledge, attitudes, and perceived preparedness regarding dietary supplements, with a four-factor structure explaining 38.3% of total variance.
The DESTEK scale achieved acceptable sampling adequacy and significant Bartlett's test results, supporting the suitability of the data for factor analysis.
Exploratory factor analysis identified a four-factor structure for the DESTEK questionnaire explaining 38.3% of total variance.
Confirmatory factor analysis demonstrated acceptable model fit for the four-factor DESTEK structure.
The total DESTEK scale demonstrated acceptable internal consistency, with subscale reliability values varying across factors.
Test-retest analysis demonstrated acceptable temporal stability of the DESTEK scale.
Convergent validity and discriminant validity of the DESTEK scale were supported by psychometric analyses.
The study identified a need for the DESTEK instrument due to the absence of any previously validated Turkish tool for assessing dietitians' supplement-related knowledge and attitudes.
The authors recommend further validation of the DESTEK scale in larger and more diverse samples before broader application.
This research describes the development and testing of a Turkish-language questionnaire called DESTEK, adapted from an existing English questionnaire (D-SCOPE), designed to measure how much dietitians know about dietary supplements, what their attitudes are, and how prepared they feel to advise patients about supplements. The researchers tested this questionnaire with 223 dietitians in Türkiye and used a series of statistical methods to check whether the questionnaire was reliable and actually measured what it was supposed to measure. They found that the questionnaire has four distinct components (factors), that it is reasonably consistent when taken at different times by the same people, and that the overall statistical tests support its use as a valid measurement tool. This research suggests that the DESTEK questionnaire could be a useful tool for researchers and healthcare educators in Türkiye who want to assess dietitians' competence in advising patients about dietary supplements, a topic of growing importance given increasing supplement use in the country. Prior to this work, no validated Turkish instrument existed for this purpose. The questionnaire's multidimensional structure means it can distinguish between different aspects of supplement-related knowledge and readiness, rather than producing just a single overall score. However, the authors note some limitations: the study was based on a relatively small sample, some subscales showed only marginal reliability, and the questionnaire explained less than 40% of the total variation in responses. This research suggests the DESTEK questionnaire shows promise but that additional studies with larger and more varied groups of dietitians are needed before it can be considered fully validated for widespread use.
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Upload Your LabsBilen A, Çalık A, Demiray P, Kandemir K, Kalkan G, Turan &, et al.. (2026). Cross-Cultural Adaptation and Psychometric Evaluation of the Turkish DESTEK (D-SCOPE) Questionnaire: A Multidimensional Assessment of Dietitians' Knowledge, Attitudes and Preparedness Regarding Dietary Supplements in Türkiye.. Journal of human nutrition and dietetics : the official journal of the British Dietetic Association. https://doi.org/10.1111/jhn.70341