Journal Article

Validity and Reproducibility of a Food Frequency Questionnaire by Cognition in an Older Biracial Sample

Martha Clare Morris, Christine C. Tangney, Julia L. Bienias, Denis A. Evans and Robert S. Wilson

in American Journal of Epidemiology

Published on behalf of Johns Hopkins Bloomberg School of Public Health

Volume 158, issue 12, pages 1213-1217
Published in print December 2003 | ISSN: 0002-9262
Published online December 2003 | e-ISSN: 1476-6256 | DOI: http://dx.doi.org/10.1093/aje/kwg290
Validity and Reproducibility of a Food Frequency Questionnaire by Cognition in  an Older Biracial Sample

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It is not currently known how dietary assessment in older persons is affected by cognition. In a 1997–2000 study, the authors assessed the validity and reproducibility of a modified Harvard self-administered food frequency questionnaire (SFFQ) among 118 Black and 114 White randomly selected participants, aged 68–99 years, of the Chicago Health and Aging Project. Participants completed multiple 24-hour dietary recall interviews (mean = 3.6) over 12 months and two SFFQs in the first and 12th months. The average energy-adjusted intraclass correlation coefficient for 15 nutrients was 0.59 for 1-year reproducibility in nutrient intake levels assessed by the SFFQ. The average energy-adjusted Pearson correlation coefficient was 0.46 for comparative validity between nutrient intake levels on the SFFQ and the dietary recalls. SFFQ reproducibility was higher among men, and comparative validity with the dietary recalls was higher among women. There were no remarkable differences in the correlations by age, race, educational level, presence of chronic conditions, or cognitive ability. The modified Harvard SFFQ is a reasonable method of dietary assessment even in a population of older persons, some of whom are at advanced age, have chronic health conditions, and have cognitive impairment.

Keywords: aged; cognition; diet; epidemiologic methods; questionnaires; reproducibility of results; Abbreviations: MMSE, Mini-Mental State Examination; SFFQ, self-administered food frequency questionnaire.

Journal Article.  3291 words. 

Subjects: Public Health and Epidemiology

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