To determine the validity and reliability of a nutrition knowledge questionnaire for adults in California.Methods:
A convenience sample of adults was recruited for cognitive interviews. A mail-based survey of 400 randomly selected addresses was used to assess internal consistency (Cronbach α). Researchers assessed content validity (Student t test) and test–retest reliability (Pearson correlation) in a convenience sample of university students who had previously taken a college nutrition course, compared with students who had not.Results:
Twenty adults participated in cognitive interviews, 94 adults returned the mailed questionnaire, and 48 university students participated in validity and reliability testing. Cronbach α = .91 and test–retest r = 0.95, demonstrating internal consistency reliability and test–retest reliability. Students who had taken a college-level nutrition course scored significantly higher compared with students who had not (P < .001), demonstrating construct validity.Conclusions and Implications:
Findings show that the questionnaire is a valid and reliable nutrition knowledge measure for use in California and may be of use in other places.