Validity and reliability testing of a short questionnaire developed to assess consumers' use, understanding and perception of food labels

D. Mackison, W. L. Wrieden, A. S. Anderson

    Research output: Contribution to journalArticle

    22 Citations (Scopus)

    Abstract

    Background: Food labels may have an important function in communicating nutrition information and have considerable potential to influence food choice and dietary behaviour.

    Objectives: To assess the validity and reliability of a short (self-complete) questionnaire designed to measure consumers' use and understanding of food labels.

    Methods: Questionnaire content was determined by gaps highlighted in a literature review of food labelling. Nineteen questions (49 items) assessing frequency of label reading perceived importance of food labels, regularity of dining out, desire to have nutrition information at specific catering outlets and ability to perform nutrition information tasks were formulated and presented on four pages of A4. With the exception of two open-ended questions, all items were presented as closed (field box) structures. Content validity, face validity, item analysis, repeat and internal reliability were assessed.

    Results: Nutrition experts (26) completed detailed content validity assessment, resulting in high scores for appropriateness, importance and phrasing of questions, although grammar and terminology changes were required. Face validity indicated that the questionnaire was quick to complete (<15 min), easy to follow and comprehensible. Cronbach's alpha scores (internal reliability) for questions with multiple sections ranged from 0.72 to 0.91, indicating good internal consistency. Repeat reliability testing showed Spearman's correlation coefficients ranging from 0.51 to 0.97 (all P<0.001) showing high temporal stability. Item Difficulty analysis indicated that questions (Section C only) were at an appropriate level (with P between 20 and 80% for all items). Item discrimination analysis ranged from r = 0.43 to 0.70, highlighting that items were suitable for inclusion.

    Conclusions: This questionnaire is a suitable tool for assessing consumers' use, understanding and perception of food labels. European Journal of Clinical Nutrition (2010) 64, 210-217; doi: 10.1038/ejcn.2009.126; published online 11 November 2009

    Original languageEnglish
    Pages (from-to)210-217
    Number of pages8
    JournalEuropean Journal of Clinical Nutrition
    Volume64
    Issue number2
    DOIs
    Publication statusPublished - Feb 2010

    Keywords

    • food labelling
    • labels
    • validity
    • reliability
    • questionnaire development
    • NUTRITION LABELS
    • KNOWLEDGE

    Cite this

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    title = "Validity and reliability testing of a short questionnaire developed to assess consumers' use, understanding and perception of food labels",
    abstract = "Background: Food labels may have an important function in communicating nutrition information and have considerable potential to influence food choice and dietary behaviour.Objectives: To assess the validity and reliability of a short (self-complete) questionnaire designed to measure consumers' use and understanding of food labels.Methods: Questionnaire content was determined by gaps highlighted in a literature review of food labelling. Nineteen questions (49 items) assessing frequency of label reading perceived importance of food labels, regularity of dining out, desire to have nutrition information at specific catering outlets and ability to perform nutrition information tasks were formulated and presented on four pages of A4. With the exception of two open-ended questions, all items were presented as closed (field box) structures. Content validity, face validity, item analysis, repeat and internal reliability were assessed.Results: Nutrition experts (26) completed detailed content validity assessment, resulting in high scores for appropriateness, importance and phrasing of questions, although grammar and terminology changes were required. Face validity indicated that the questionnaire was quick to complete (<15 min), easy to follow and comprehensible. Cronbach's alpha scores (internal reliability) for questions with multiple sections ranged from 0.72 to 0.91, indicating good internal consistency. Repeat reliability testing showed Spearman's correlation coefficients ranging from 0.51 to 0.97 (all P<0.001) showing high temporal stability. Item Difficulty analysis indicated that questions (Section C only) were at an appropriate level (with P between 20 and 80{\%} for all items). Item discrimination analysis ranged from r = 0.43 to 0.70, highlighting that items were suitable for inclusion.Conclusions: This questionnaire is a suitable tool for assessing consumers' use, understanding and perception of food labels. European Journal of Clinical Nutrition (2010) 64, 210-217; doi: 10.1038/ejcn.2009.126; published online 11 November 2009",
    keywords = "food labelling, labels, validity, reliability, questionnaire development, NUTRITION LABELS, KNOWLEDGE",
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    T1 - Validity and reliability testing of a short questionnaire developed to assess consumers' use, understanding and perception of food labels

    AU - Mackison, D.

    AU - Wrieden, W. L.

    AU - Anderson, A. S.

    PY - 2010/2

    Y1 - 2010/2

    N2 - Background: Food labels may have an important function in communicating nutrition information and have considerable potential to influence food choice and dietary behaviour.Objectives: To assess the validity and reliability of a short (self-complete) questionnaire designed to measure consumers' use and understanding of food labels.Methods: Questionnaire content was determined by gaps highlighted in a literature review of food labelling. Nineteen questions (49 items) assessing frequency of label reading perceived importance of food labels, regularity of dining out, desire to have nutrition information at specific catering outlets and ability to perform nutrition information tasks were formulated and presented on four pages of A4. With the exception of two open-ended questions, all items were presented as closed (field box) structures. Content validity, face validity, item analysis, repeat and internal reliability were assessed.Results: Nutrition experts (26) completed detailed content validity assessment, resulting in high scores for appropriateness, importance and phrasing of questions, although grammar and terminology changes were required. Face validity indicated that the questionnaire was quick to complete (<15 min), easy to follow and comprehensible. Cronbach's alpha scores (internal reliability) for questions with multiple sections ranged from 0.72 to 0.91, indicating good internal consistency. Repeat reliability testing showed Spearman's correlation coefficients ranging from 0.51 to 0.97 (all P<0.001) showing high temporal stability. Item Difficulty analysis indicated that questions (Section C only) were at an appropriate level (with P between 20 and 80% for all items). Item discrimination analysis ranged from r = 0.43 to 0.70, highlighting that items were suitable for inclusion.Conclusions: This questionnaire is a suitable tool for assessing consumers' use, understanding and perception of food labels. European Journal of Clinical Nutrition (2010) 64, 210-217; doi: 10.1038/ejcn.2009.126; published online 11 November 2009

    AB - Background: Food labels may have an important function in communicating nutrition information and have considerable potential to influence food choice and dietary behaviour.Objectives: To assess the validity and reliability of a short (self-complete) questionnaire designed to measure consumers' use and understanding of food labels.Methods: Questionnaire content was determined by gaps highlighted in a literature review of food labelling. Nineteen questions (49 items) assessing frequency of label reading perceived importance of food labels, regularity of dining out, desire to have nutrition information at specific catering outlets and ability to perform nutrition information tasks were formulated and presented on four pages of A4. With the exception of two open-ended questions, all items were presented as closed (field box) structures. Content validity, face validity, item analysis, repeat and internal reliability were assessed.Results: Nutrition experts (26) completed detailed content validity assessment, resulting in high scores for appropriateness, importance and phrasing of questions, although grammar and terminology changes were required. Face validity indicated that the questionnaire was quick to complete (<15 min), easy to follow and comprehensible. Cronbach's alpha scores (internal reliability) for questions with multiple sections ranged from 0.72 to 0.91, indicating good internal consistency. Repeat reliability testing showed Spearman's correlation coefficients ranging from 0.51 to 0.97 (all P<0.001) showing high temporal stability. Item Difficulty analysis indicated that questions (Section C only) were at an appropriate level (with P between 20 and 80% for all items). Item discrimination analysis ranged from r = 0.43 to 0.70, highlighting that items were suitable for inclusion.Conclusions: This questionnaire is a suitable tool for assessing consumers' use, understanding and perception of food labels. European Journal of Clinical Nutrition (2010) 64, 210-217; doi: 10.1038/ejcn.2009.126; published online 11 November 2009

    KW - food labelling

    KW - labels

    KW - validity

    KW - reliability

    KW - questionnaire development

    KW - NUTRITION LABELS

    KW - KNOWLEDGE

    U2 - 10.1038/ejcn.2009.126

    DO - 10.1038/ejcn.2009.126

    M3 - Article

    VL - 64

    SP - 210

    EP - 217

    JO - European Journal of Clinical Nutrition

    JF - European Journal of Clinical Nutrition

    SN - 0954-3007

    IS - 2

    ER -