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Development of a Questionnaire to Measure Nutrition Knowledge in Adults

The objective of this study was to develop a valid and reliable questionnaire to measure nutrition knowledge in adults. A pool of questions was assembled from existing questionnaires with new questions written based on national dietary recommendations. Cognitive interviews were conducted (n=20), followed by a mail‐based pilot test. Four hundred randomly‐selected addresses in California received a questionnaire, and 94 were returned (24% response rate). Pilot test data were used to measure internal consistency, item discrimination, and item difficulty. Items that did not meet predefined criteria for these were removed. Following the pilot test, a sample of 21 non‐nutrition and 24 nutrition students were recruited to evaluate test‐retest reliability and construct validity of the final questionnaire. Each questionnaire section was found to have adequate internal consistency (Cronbach's α=0.85; 0.81; 0.81). Test‐retest reliability, measured by correlation between first and second questionnaire scores for each section, was moderate to high (r=0.90; 0.60; 0.80) with total reliability equal to 0.93. Knowledge scores were significantly higher in nutrition students than non‐nutrition students, as determined by student's t‐test (p<0.001). Results suggest the questionnaire is a valid and reliable tool for measuring nutrition knowledge. This study was funded by the Henry A. Jastro Graduate Research Award.