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

Area of Science:

• Nutrition Science
• Psychometrics
• Health Education

Background:

• Accurate measurement of nutrition knowledge is crucial for public health.
• Existing nutrition knowledge questionnaires may lack robust development and validation.
• Standardized methodologies are needed to improve the quality of nutrition knowledge assessment.

Purpose of the Study:

• To provide evidence-based guidelines for developing valid and reliable nutrition knowledge questionnaires.
• To outline a comprehensive methodology for questionnaire construction and evaluation.
• To address statistical considerations in nutrition knowledge assessment.

Main Methods:

• Systematic literature review on questionnaire development across various fields.
• Development of an eight-step methodology tailored for nutrition knowledge questionnaires.
• Incorporation of qualitative methods and statistical considerations, including item analysis, factor analysis, and Rasch analysis.

Main Results:

• An eight-step methodology encompassing construct definition, item generation, scoring, validity assessment (content, face), scale purification (item analysis), and scale evaluation (factor structure, reliability, Rasch analysis).
• Emphasis on advanced statistical techniques like factor analysis and Rasch analysis for robust evaluation.
• Identification of previously overlooked methods in nutrition knowledge questionnaire development.

Conclusions:

• Implementing the proposed methodology enhances the validity and reliability of nutrition knowledge measures.
• Advanced statistical analyses (factor analysis, Rasch analysis) increase confidence in reported nutrition knowledge.
• Improved questionnaire development is essential for advancing nutrition research and practice.