Reproducibility and validity of dietary patterns assessed with a food-frequency questionnaire
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Hu, Frank B.
Rimm, Eric Bruce::0ab2926c8242f35e5a982e3cf59f4987::600
Smith-Warner, Stephanie A.
Willett, Walter C.::94559ea206eef8a8844fc5b80654fa5b::600
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CitationKhani, Bahram Rashid, Weimin Ye, Paul Terry, and Alicja Wolk. 2004. “Reproducibility and Validity of Major Dietary Patterns among Swedish Women Assessed with a Food-Frequency Questionnaire.” The Journal of Nutrition 134 (6): 1541–45. https://doi.org/10.1093/jn/134.6.1541.
AbstractBackground: Recently, the analysis of dietary patterns has emerged as a possible approach to examining diet-disease relations. Objective: We examined the reproducibility and validity of dietary patterns defined by factor analysis using dietary data collected with a food-frequency questionnaire (FFQ). Design: We enrolled a subsample of men (n = 127) from the Health Professionals Follow-up Study in a diet-validation study in 1986. A 131-item FFQ was administered twice, 1 y apart, and two l-wk diet records and blood samples were collected during this 1-y interval. Results: Using factor analysis, we identified 2 major eating patterns, which were qualitatively similar across the 2 FFQs and the diet records, The first factor, the prudent dietary pattern, was characterized by a high intake of vegetables, fruit, legumes, whole grains, and fish and other seafood, whereas the second factor, the Western pattern, was characterized by a high intake of processed meat, red meat, butter, high-fat dairy products, eggs, and refined grains. The reliability correlations for the factor scores between the 2 FFQs were 0.70 for the prudent pattern and 0.67 for the Western pattern. The correlations (corrected for week-to-week variation in diet records) between the 2 FFQs and diet records ranged from 0.45 to 0.74 for the 2 patterns. In addition, the correlations between the factor scores and nutrient intakes and plasma concentrations of biomarkers were in the expected direction. Conclusions: These data indicate reasonable reproducibility and validity of the major dietary patterns defined by factor analysis with data from an FFQ.
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