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. 2010 Aug;2(8):805-19.
doi: 10.3390/nu2080805. Epub 2010 Jul 28.

A food frequency questionnaire for the assessment of calcium, vitamin D and vitamin K: a pilot validation study

Janet M Pritchard  1 , Tinasha Seechurn, Stephanie A Atkinson
Affiliations

A food frequency questionnaire for the assessment of calcium, vitamin D and vitamin K: a pilot validation study

Janet M Pritchard et al. Nutrients. 2010 Aug.

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: bone; calcium; food frequency questionnaire; osteoporosis; validation; vitamin D; vitamin K.

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Figures

Figure 1
Figure 1
(A) Bland-Altman plots to assess agreement and systematic difference between the FFQ and 5DDR for calcium intake, (B) vitamin D intake and, (C) vitamin K intake.
See this image and copyright information in PMC

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