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 |
