Reproducibility and validity of dietary patterns assessed with a food-frequency questionnaire.
Am J Clin Nutr
; 69(2): 243-9, 1999 Feb.
Article
in En
| MEDLINE
| ID: mdl-9989687
ABSTRACT
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.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Diet Records
/
Surveys and Questionnaires
/
Feeding Behavior
Type of study:
Etiology_studies
/
Observational_studies
/
Prognostic_studies
/
Risk_factors_studies
Limits:
Adult
/
Aged
/
Humans
/
Male
/
Middle aged
Language:
En
Journal:
Am J Clin Nutr
Year:
1999
Document type:
Article
Affiliation country:
United States