Developing and validating a nutrition knowledge questionnaire : Key methods and considerations

Journal article

Trakman, Gina Louise, Forsyth, Adrienne, Hoye, Russell and Belski, Regina. (2017). Developing and validating a nutrition knowledge questionnaire : Key methods and considerations. Public Health Nutrition. 20(15), pp. 2670-2679. https://doi.org/10.1017/S1368980017001471
AuthorsTrakman, Gina Louise, Forsyth, Adrienne, Hoye, Russell and Belski, Regina
Abstract

Objective
To outline key statistical considerations and detailed methodologies for the development and evaluation of a valid and reliable nutrition knowledge questionnaire.

Design
Literature on questionnaire development in a range of fields was reviewed and a set of evidence-based guidelines specific to the creation of a nutrition knowledge questionnaire have been developed. The recommendations describe key qualitative methods and statistical considerations, and include relevant examples from previous papers and existing nutrition knowledge questionnaires. Where details have been omitted for the sake of brevity, the reader has been directed to suitable references.

Results
We recommend an eight-step methodology for nutrition knowledge questionnaire development as follows: (i) definition of the construct and development of a test plan; (ii) generation of the item pool; (iii) choice of the scoring system and response format; (iv) assessment of content validity; (v) assessment of face validity; (vi) purification of the scale using item analysis, including item characteristics, difficulty and discrimination; (vii) evaluation of the scale including its factor structure and internal reliability, or Rasch analysis, including assessment of dimensionality and internal reliability; and (viii) gathering of data to re-examine the questionnaire’s properties, assess temporal stability and confirm construct validity. Several of these methods have previously been overlooked.

Conclusions
The measurement of nutrition knowledge is an important consideration for individuals working in the nutrition field. Improved methods in the development of nutrition knowledge questionnaires, such as the use of factor analysis or Rasch analysis, will enable more confidence in reported measures of nutrition knowledge.

Keywordsquestionnaire; nutrition knowledge; factor analysis; Rasch analysis
Year2017
JournalPublic Health Nutrition
Journal citation20 (15), pp. 2670-2679
PublisherCambridge University Press
ISSN1475-2727
Digital Object Identifier (DOI)https://doi.org/10.1017/S1368980017001471
Scopus EID2-s2.0-85025425943
Research or scholarlyResearch
Page range2670-2679
Publisher's version
License
All rights reserved
File Access Level
Controlled
Output statusPublished
Publication dates
Online24 Jul 2017
Publication process dates
Accepted26 May 2017
Deposited16 Aug 2022
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