Race-specific validation of food intake obtained from a comprehensive FFQ: the Adventist Health Study-2
| Autor: | Joan Sabaté, Jing Fan, Ella Haddad, Synnove F. Knutsen, R. Patti Herring, W. Lawrence Beeson, Terrence L Butler, Karen Jaceldo-Siegl, Hannelore Bennett, Gary E. Fraser |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Gerontology
Adult Male Canada Population Medicine (miscellaneous) Black People Epidemiological method Diet Surveys Article White People Food group Cohort Studies Environmental health Surveys and Questionnaires Medicine Humans Prospective cohort study education Aged education.field_of_study Nutrition and Dietetics business.industry Public Health Environmental and Occupational Health food and beverages Feeding Behavior Middle Aged United States Diet Relative risk Cohort Calibration Mental Recall Female business Energy Intake Cohort study |
| Popis: | The FFQ is designed to measure the usual food intake of an individual over a defined period. It is easy and relatively inexpensive to administer and is therefore the preferred dietary assessment method for use in large-scale nutritional epidemiological studies(1). However, data from an FFQ do not represent the ‘true’ usual diet as such data suffer from random and systematic errors, which attenuate relative risk estimates in studies on diet and disease risk(2–4). Since an FFQ is typically used to determine the relationship between foods or food groups and disease risk, and also to identify foods or food groups that contribute to specific nutrients of interest, it is important to evaluate the extent to which such questionnaires can measure true intakes. One approach to examining the performance of an FFQ is through a validation study in which assessment of individual diets by means of a questionnaire is compared with assessment using a more precise reference method(5). The Adventist Health Study-2 (AHS-2) is a prospective cohort study of over 96000 adult Adventists in the USA and Canada. Over 25000 cohort members are blacks of US and Caribbean descent; the remaining are of other races, mostly whites. The primary aim of the study is to relate usual dietary habits to cancer outcomes. The AHS-2 cohort is relatively unique for its wide range of dietary patterns compared with the general Western population. For example, 8% are vegan, 28% are lacto-ovo vegetarian, 16% are semi- or pesco-vegetarian and 48% are non-vegetarian. In addition, there exists large variation in the consumption of plant foods such as nuts, soya, other legumes and grains. Dietary exposure in AHS-2 is assessed primarily by means of an FFQ. The validation of nutrient intake estimates has been reported previously(6). On average, energy-adjusted de-attenuated validity correlations were 0·60 in whites and 0·52 in blacks across fifty-one nutrients. In the present study, we sought to validate intake estimates of foods and food groups obtained using the AHS-2 FFQ by comparing them with intake estimates obtained using repeated 24 h dietary recalls (24HDR). |
| Databáze: | OpenAIRE |
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