Estimating the relationship between dietary intake obtained from a food frequency questionnarie and true average intake /
| Main Authors: | , , |
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| Corporate Authors: | , |
| Format: | Book |
| Language: | English |
| Published: |
College Station, Texas :
Department of Statistics, Texas A & M University,
1990.
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| Series: | Technical report (Texas A & M University. Department of Statistics) ;
no. 117. |
| Subjects: |
| Abstract: | Knowledge of the regression relation between dietary intake reported on a food frequency questionnaire and true average intake is useful in interpreting results from nutritional epidemiologic studies and in planning such studies. Studies which validate a questionnaire against a food record may be used to estimate this regression relationship provided the food record is completed by each subject on at least two occasions. Using data from the pilot study of the Women's Health Trial, we show how variation in diet over time and intraindividual correlation between a questionnaire and food record obtained close together in time affects the estimation of the regression. The authors' method provides estimates of the regression slope and the questionnaire "bias" that are corrected for these effects, together with standard errors. In an Appendix we provide a SAS program to carry out the analysis. |
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| Item Description: | Offprint. "Prepared for submission to American Journal of Epidemiology - 8/1/90"--Leaf 1. Funding information taken from leaf 2. |
| Physical Description: | 22 pages, that is, 22 leaves, 5 unnumbered leaves ; 28 cm |
| Bibliography: | Includes bibliographical references (leaves 15-16). |