Indexes of food and nutrient intakes as predictors of serum concentrations of nutrients: The problem of inadequate discriminant validity Conference Paper


Authors: Marshall, J. R.; Lanza, E.; Bloch, A.; Caan, B.; Caggiula, A.; Quandt, S.; Iber, F.; Kikendall, W.; Slattery, M.; Sowell, A.; for the Polyp Prevention Trial Study Group
Title: Indexes of food and nutrient intakes as predictors of serum concentrations of nutrients: The problem of inadequate discriminant validity
Conference Title: 2nd International Conference on Dietary Assessment Methods
Abstract: Nutrient indexes derived from food-frequency questionnaires have generally been regarded as acceptably valid for epidemiologic purposes. Evaluations of these indexes, however, have considered only their convergent validity. We suggest that discriminant validity, or the ability to distinguish among exposures to different nutrients, is also important. Using baseline data from a large clinical trial, we tested the discriminant validity of indexes of intake of vitamin E, alpha-carotene, and beta-carotene. Our results suggest that the vitamin E index possesses neither convergent nor discriminant validity, the alpha-carotene index adequate convergent and discriminant validity, and the beta-carotene index adequate convergent but no discriminant validity.
Keywords: diet; discriminant validity; validity; fat; men; database; vitamin e; alpha-tocopherol; beta-carotene; food-frequency questionnaire; convergent validity; cancer; alpha-carotene; frequency questionnaire
Journal Title American Journal of Clinical Nutrition
Volume: 65
Issue: 4 Suppl.
Conference Dates: 1995 Jan 22-24
Conference Location: Boston, MA
ISBN: 0002-9165
Publisher: American Society for Nutrition  
Date Published: 1997-04-01
Start Page: 1269S
End Page: 1274S
Language: English
ACCESSION: WOS:A1997WR60600031
PROVIDER: wos
PUBMED: 9094932
Notes: Article; Proceedings Paper -- Source: Wos