| Validation of a semi-quantitative food frequency questionnaire measuring dietary vitamin K intake in elderly people. | |
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MedLine Citation:
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PMID: 19559145 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The study objective was to validate a semi-quantitative food frequency questionnaire (FFQ) specifically designed to measure dietary vitamin K intake. A 50-item FFQ was interviewer-administered and compared with data previously obtained from 5-day food records. Thirty-nine community-dwelling healthy men and women aged 65 to 85 years were recruited from the Montréal metropolitan area. Absolute and relative agreements between methods were assessed. Vitamin K intake measured by the vitamin K FFQ (mean+/-standard deviation; 222+/-186 microg/day) was significantly higher than that obtained by food records (135+/-153 microg/day; P<0.001). Bland-Altman analysis on log(10)-transformed data indicated that vitamin K intake from vitamin K FFQ was 2.26 times (95% confidence interval: 1.90 to 2.67) higher than food records, limits of agreement ranging from 0.80 to 6.35. However, correlation between methods was strong and highly significant (r=0.83; P<0.001). Cross-classification also showed that 72% of participants were correctly classified into thirds and only 8% were grossly miscategorized. Weighted kappa value (kappa=0.60) also indicated a good relative agreement. In light of these results, the vitamin K FFQ is a valid tool for ranking individuals according to their vitamin K intake. The poor absolute agreement likely results from the inability for food records to adequately measure the usual intake of episodically consumed foods, particularly those high in vitamin K. The vitamin K FFQ will be useful in large-scale, population-based research on vitamin K and disease as well as in clinical practice, especially that focusing on anticoagulant therapy. |
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Authors:
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Nancy Presse; Bryna Shatenstein; Marie-Jeanne Kergoat; Guylaine Ferland |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Validation Studies |
Journal Detail:
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Title: Journal of the American Dietetic Association Volume: 109 ISSN: 1878-3570 ISO Abbreviation: J Am Diet Assoc Publication Date: 2009 Jul |
Date Detail:
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Created Date: 2009-06-29 Completed Date: 2009-07-09 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7503061 Medline TA: J Am Diet Assoc Country: United States |
Other Details:
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Languages: eng Pagination: 1251-5 Citation Subset: AIM; IM |
Affiliation:
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Centre de recherche, Institut universitaire de gériatrie de Montréal and Département de nutrition, Université de Montréal, Montréal, Canada. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Aged Aged, 80 and over Antifibrinolytic Agents / administration & dosage* Diet Records Female Geriatric Assessment* Humans Male Nutrition Assessment* Nutritional Requirements Quebec Questionnaires / standards* Reproducibility of Results Sensitivity and Specificity Vitamin K / administration & dosage* Vitamin K Deficiency / diagnosis |
| Chemical | |
Reg. No./Substance:
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0/Antifibrinolytic Agents; 12001-79-5/Vitamin K |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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