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Knowledge about dietary supplements and trust in advertising them: Development and validation of the questionnaires and preliminary results of the association between the constructs

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  • Michał Seweryn Karbownik
  • Ewelina Paul
  • Maja Nowicka
  • Zuzanna Nowicka
  • Radosław Przemysław Kowalczyk
  • Edward Kowalczyk
  • Tadeusz Pietras

Abstract

Background: Despite offering little overall benefit and emerging concerns about their safety, dietary supplements have become increasingly popular. Trust in advertising them may contribute to high confidence in dietary supplements in public opinion. Aim: To develop and validate a screening questionnaire intended for the general public regarding knowledge about dietary supplements and a questionnaire on trust in advertising dietary supplements, and to identify the association between these constructs. Materials and methods: The development and validation of the measures was overseen by the panels of experts. The conceptual frameworks of the constructs were scientifically well grounded. A set of semi-structured interviews and anonymous web-based surveys was performed. The final questionnaire was applied to 220 non-medically educated people and 121 medically educated people. Results: A 17-item questionnaire on knowledge about dietary supplements and eight-item questionnaire on trust in advertising dietary supplements were developed. The measures presented satisfactory proof of validity, however, the psychometric properties of the questionnaire on knowledge were modest. Both the knowledge about dietary supplements in the study group and trust in advertising them were low. A significant negative relationship was found between knowledge about dietary supplements and trust in advertising them among the general public (Pearson’s r = -0.42, 95%CI: -0.52 to -0.30, p

Suggested Citation

  • Michał Seweryn Karbownik & Ewelina Paul & Maja Nowicka & Zuzanna Nowicka & Radosław Przemysław Kowalczyk & Edward Kowalczyk & Tadeusz Pietras, 2019. "Knowledge about dietary supplements and trust in advertising them: Development and validation of the questionnaires and preliminary results of the association between the constructs," PLOS ONE, Public Library of Science, vol. 14(6), pages 1-24, June.
    • Handle: RePEc:plo:pone00:0218398
    DOI: 10.1371/journal.pone.0218398
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    References listed on IDEAS

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    1. Cees van der Eijk & Jonathan Rose, 2015. "Risky Business: Factor Analysis of Survey Data – Assessing the Probability of Incorrect Dimensionalisation," PLOS ONE, Public Library of Science, vol. 10(3), pages 1-31, March.
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    1. Jinkyung Choi, 2019. "The Association Between Health Conditions, Consciousness, Involvement, and Knowledge and Dietary Supplement Intake among University Students in South Korea," IJERPH, MDPI, vol. 16(20), pages 1-12, October.
    2. Shian-Yang Tzeng & Tzu-Ya Ho, 2022. "Exploring the Effects of Product Knowledge, Trust, and Distrust in the Health Belief Model to Predict Attitude Toward Dietary Supplements," SAGE Open, , vol. 12(1), pages 21582440211, January.
    3. Regina Ewa Wierzejska & Agnieszka Wiosetek-Reske & Magdalena Siuba-Strzelińska & Barbara Wojda, 2022. "Health-Related Content of TV and Radio Advertising of Dietary Supplements—Analysis of Legal Aspects after Introduction of Self-Regulation for Advertising of These Products in Poland," IJERPH, MDPI, vol. 19(13), pages 1-15, June.

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