Estimating the relation between dietary intake obtained from a food frequency questionnaire and true average intake
| Autor: | Yohanan Wax, Laurence S. Freedman, Raymond J. Carroll |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Gerontology
medicine.medical_specialty Relation (database) Epidemiology Pilot Projects Diet Surveys Bias Surveys and Questionnaires medicine Humans Aged Estimation Public health Food frequency questionnaire Reproducibility of Results Regression analysis Feeding Behavior Middle Aged Regression Standard error Regression Analysis Female Psychology Software Demography |
| Zdroj: | American journal of epidemiology. 134(3) |
| ISSN: | 0002-9262 |
| Popis: | 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 relation provided the food record is completed by each subject on at least two occasions. Using data collected from women aged 45-69 years during 1985-1986 in the pilot study of the Women's Health Trial, the authors 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. A computer program in the SAS language, for carrying out the analysis, is provided. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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