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ToolsLentjes, Marleen A H, Welch, Ailsa A, Luben, Robert N and Khaw, Kay-Tee (2013) Differences in dietary supplement use and secular and seasonal trends assessed using three different instruments in the EPIC-Norfolk population study. Journal of Dietary Supplements, 10 (2). pp. 142-151. ISSN 1939-0211
Full text not available from this repository. (Request a copy)Abstract
Objective: Supplement use has increased over time and measurements of supplement use are dependent on instruments chosen. Therefore, we investigated three different questionnaires to measure supplement use and whether these results were associated with age, year of recruitment (secular trend, 1993-1998), and seasonal trends. Design: The questionnaires were self-administered within a median time interval of 54 days and included a Health and Lifestyle Questionnaire (1-year recall), a Food Frequency Questionnaire (1-year recall), and a 7-day diet diary. Setting: Men and women, aged 40-79 years from the general population living in Norfolk (East Anglia, UK), recruited between 1993 and 1998 in the European Prospective Investigation into Cancer Study (EPIC-Norfolk). Results: The prevalence of supplement use estimated with different instruments ranged from 31.7% to 39.0% for men and 45.0% to 54.3% for women. Agreement was substantial with kappa-statistics between 0.72 and 0.81. Participants' age (men only) and recruitment year were independently associated with supplement use; season showed inconsistent results. Conclusions: The diary provides a good agreement as measured by the kappa-statistic, compared to more long-term measures of supplement use classification. The secular and seasonal trends in supplement use and type of assessment instrument need to be taken into account in studies on health and supplement use.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | adult,age factors,aged,cohort studies,cross-sectional studies,decision trees,diet records,diet surveys,dietary supplements,england,female,humans,male,middle aged,prospective studies,reproducibility of results,seasons,self care,sex characteristics,sdg 3 - good health and well-being ,/dk/atira/pure/sustainabledevelopmentgoals/good_health_and_well_being |
| Faculty \ School: | Faculty of Medicine and Health Sciences > Norwich Medical School |
| UEA Research Groups: | Faculty of Medicine and Health Sciences > Research Groups > Epidemiology and Public Health Faculty of Medicine and Health Sciences > Research Groups > Public Health and Health Services Research (former - to 2023) Faculty of Science > Research Groups > Norwich Epidemiology Centre Faculty of Medicine and Health Sciences > Research Groups > Norwich Epidemiology Centre Faculty of Medicine and Health Sciences > Research Centres > Population Health |
| Related URLs: | |
| Depositing User: | Pure Connector |
| Date Deposited: | 01 Oct 2013 00:57 |
| Last Modified: | 19 Oct 2023 01:11 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/43496 |
| DOI: | 10.3109/19390211.2013.790336 |
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