Heather D Gibbs1, Edward F Ellerbeck2, Byron Gajewski3, Chuanwu Zhang3, Debra K Sullivan4. 1. Department of Dietetics and Nutrition, University of Kansas Medical Center, Kansas City, KS. Electronic address: hgibbs@kumc.edu. 2. Department of Preventive Medicine, University of Kansas Medical Center, Kansas City, KS. 3. Department of Biostatistics, University of Kansas Medical Center, Kansas City, KS. 4. Department of Dietetics and Nutrition, University of Kansas Medical Center, Kansas City, KS.
Abstract
OBJECTIVE: To test the reliability and validity of the Nutrition Literacy Assessment Instrument (NLit) in adult primary care and identify the relationship between nutrition literacy and diet quality. DESIGN: This instrument validation study included a cross-sectional sample participating in up to 2 visits 1 month apart. SETTING/PARTICIPANTS: A total of 429 adults with nutrition-related chronic disease were recruited from clinics and a patient registry affiliated with a Midwestern university medical center. MAIN OUTCOME MEASURES: Nutrition literacy was measured by the NLit, which was composed of 6 subscales: nutrition and health, energy sources in food, food label and numeracy, household food measurement, food groups, and consumer skills. Diet quality was measured by Healthy Eating Index-2010 with nutrient data from Diet History Questionnaire II surveys. ANALYSIS: The researchers measured factor validity and reliability by using binary confirmatory factor analysis; test-retest reliability was measured by Pearson r and the intraclass correlation coefficient, and relationships between nutrition literacy and diet quality were analyzed by linear regression. RESULTS: The NLit demonstrated substantial factor validity and reliability (0.97; confidence interval, 0.96-0.98) and test-retest reliability (0.88; confidence interval, 0.85-0.90). Nutrition literacy was the most significant predictor of diet quality (β = .17; multivariate coefficient = 0.10; P < .001). CONCLUSIONS: The NLit is a valid and reliable tool for measuring nutrition literacy in adult primary care patients.
OBJECTIVE: To test the reliability and validity of the Nutrition Literacy Assessment Instrument (NLit) in adult primary care and identify the relationship between nutrition literacy and diet quality. DESIGN: This instrument validation study included a cross-sectional sample participating in up to 2 visits 1 month apart. SETTING/PARTICIPANTS: A total of 429 adults with nutrition-related chronic disease were recruited from clinics and a patient registry affiliated with a Midwestern university medical center. MAIN OUTCOME MEASURES: Nutrition literacy was measured by the NLit, which was composed of 6 subscales: nutrition and health, energy sources in food, food label and numeracy, household food measurement, food groups, and consumer skills. Diet quality was measured by Healthy Eating Index-2010 with nutrient data from Diet History Questionnaire II surveys. ANALYSIS: The researchers measured factor validity and reliability by using binary confirmatory factor analysis; test-retest reliability was measured by Pearson r and the intraclass correlation coefficient, and relationships between nutrition literacy and diet quality were analyzed by linear regression. RESULTS: The NLit demonstrated substantial factor validity and reliability (0.97; confidence interval, 0.96-0.98) and test-retest reliability (0.88; confidence interval, 0.85-0.90). Nutrition literacy was the most significant predictor of diet quality (β = .17; multivariate coefficient = 0.10; P < .001). CONCLUSIONS: The NLit is a valid and reliable tool for measuring nutrition literacy in adult primary care patients.
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