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American Journal of Clinical Nutrition, Vol. 69, No. 2, 243-249, February 1999
© 1999 American Society for Clinical Nutrition


Original Research Communications

Reproducibility and validity of dietary patterns assessed with a food-frequency questionnaire1,2,3

Frank B Hu, Eric Rimm, Stephanie A Smith-Warner, Diane Feskanich, Meir J Stampfer, Albert Ascherio, Laura Sampson and Walter C Willett

Background: 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 1-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.

Key Words: Diet • dietary pattern • factor analysis • biomarker • reproducibility • validity • men • Health Professionals Follow-up Study • food-frequency questionnaire




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