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Reliability of a food frequency questionnaire to assess dietary antioxidant intake
journal contribution
posted on 1997-01-01, 00:00 authored by C A McCarty, C De Paola, Trish LivingstonTrish Livingston, H R TaylorOBJECTIVE: Epidemiologic evidence of a role for antioxidants in the prevention of chronic disease has been inconclusive, in part due to the difficulty of measuring past diets of free-living populations. The purpose of the current study was to examine the reliability of a 19-item, self-administered, semiquantitative, food frequency questionnaire to assess intake of the major dietary antioxidants. METHODS: Reliability was established by administering the food frequency questionnaire a second time by telephone. The subjects comprised 151 participants in the Melbourne Visual Impairment Project, a study of the distribution and determinants of eye disease in Melbourne residents aged 40 and over. RESULTS: Spearman correlation coefficients ranged from 0.39 for spinach to 0.76 for yoghurt, and all were highly significant (all p = 0.001). The reliability of the instrument was not influenced by gender, English speaking ability, or the number of days between the first and second administration of the questionnaire. CONCLUSION: In conclusion, we have shown this 19-item food frequency questionnaire to be highly reliable. It should be useful for anyone involved in the study of the relationship of dietary antioxidant intake to health outcomes in large populations where limitations of time and money prohibit the collection of more detailed dietary intake information.
History
Journal
Ophthalmic epidemiologyVolume
4Issue
1Pagination
33 - 39Publisher
Taylor & FrancisLocation
London, Eng.Publisher DOI
ISSN
0928-6586Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
1997, Taylor & FrancisUsage metrics
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