Nutrients 2010, 2(8), 805-819; doi:10.3390/nu2080805
Article

A Food Frequency Questionnaire for the Assessment of Calcium, Vitamin D and Vitamin K: A Pilot Validation Study

Received: 9 June 2010; in revised form: 16 July 2010 / Accepted: 17 July 2010 / Published: 28 July 2010
(This article belongs to the Special Issue Dietary Calcium)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: The study objective was to validate a food frequency questionnaire (FFQ) to assess calcium, vitamin D and vitamin K intakes in overweight and obese postmenopausal community-dwelling women. The FFQ was validated against intakes derived from a 5-day diet record (5DDR) that also included assessment of supplement intake. Strong correlations between methods were observed for all nutrients (r = 0.63, 0.89, 0.54 for calcium, vitamin D and vitamin K, respectively) and cross-classification analyses demonstrated no major misclassification of participants into intake quartiles. Bland-Altman analysis showed that the FFQ overestimated intakes for calcium, by 576 mg/day (95% CI, −668 to 1,821 mg/day), for vitamin D by 75 IU/day (95% CI, −359 to 510 IU/day), and for vitamin K by 167 mcg/day (95% CI, −233 to 568 mcg/day). This pilot study showed promising validation evidence for the use of this FFQ, which focuses on calcium, vitamin D and vitamin K intakes in postmenopausal women, as a screening tool in clinical and research settings.
Keywords: osteoporosis; bone; calcium; vitamin D; vitamin K; food frequency questionnaire; validation
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MDPI and ACS Style

Pritchard, J.M.; Seechurn, T.; Atkinson, S.A. A Food Frequency Questionnaire for the Assessment of Calcium, Vitamin D and Vitamin K: A Pilot Validation Study. Nutrients 2010, 2, 805-819.

AMA Style

Pritchard JM, Seechurn T, Atkinson SA. A Food Frequency Questionnaire for the Assessment of Calcium, Vitamin D and Vitamin K: A Pilot Validation Study. Nutrients. 2010; 2(8):805-819.

Chicago/Turabian Style

Pritchard, Janet M.; Seechurn, Tinasha; Atkinson, Stephanie A. 2010. "A Food Frequency Questionnaire for the Assessment of Calcium, Vitamin D and Vitamin K: A Pilot Validation Study." Nutrients 2, no. 8: 805-819.

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