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Public Health Nutr. 2016 Feb;19(3):437-45. doi: 10.1017/S136898001500138X. Epub 2015 May 11.

Validity of an FFQ assessing the vitamin D intake of young Serbian women living in a region without food fortification: the method of triads model.

Author information

1
1Centre of Research Excellence in Nutrition and Metabolism,Institute for Medical Research,University of Belgrade,Tadeusa Koscuska 1,11000 Belgrade,Serbia.
2
2School of Dietetics and Human Nutrition,McGill University,Macdonald Campus,Ste. Anne-de-Bellevue,Québec,Canada.
3
3Faculty of Chemistry,University of Belgrade,Belgrade,Serbia.

Abstract

OBJECTIVE:

The objective of the present study was to examine the external validity of an FFQ designed to estimate dietary vitamin D intake compared with a plasma biomarker and three repeated 24 h dietary recalls in women of reproductive age in Serbia, where there is no exposure to food fortified with vitamin D. The method of triads was applied.

DESIGN:

In a cross-sectional study, 422 women completed the Women and Reproductive Health FFQ (WRH-FFQ) during the winter months. From a representative subgroup (n 44), three 24 h dietary recalls and anthropometric parameters were collected as well as a fasting blood sample for vitamin D biomarker analyses. Correlation coefficients were calculated between each of the dietary methods. Validity coefficients, as a correlation between the measured and estimated 'true' exposure, were calculated using the method of triads. Bland-Altman plots were also constructed.

SETTING:

Three major universities in Serbia.

SUBJECTS:

Healthy young women (n 422) aged 18-35 years.

RESULTS:

The WRH-FFQ estimate of vitamin D intake for all participants was 4.0 (sd 3.3) µg/d and 3.1 (sd 2.3) µg/d for the subgroup. Bland-Altman plots for these intakes showed high agreement. Validity coefficients for the FFQ, 24 h recall and biomarker were ρ QI=0.847 (95% CI 0.564, 0.928), ρ RI=0.810 (95% CI 0.537, 0.997) and ρ BI=0.499 (95% CI 0.190, 0.840), while the correlation coefficients were 0.686, 0.422 and 0.404.

CONCLUSIONS:

The FFQ applied in the present study is a valid tool for assessing dietary vitamin D intake in women living in Serbia, a region without mandatory vitamin D food fortification.

KEYWORDS:

FFQ; Method of triads; Reproductive health; Validation; Vitamin D; Women

PMID:
25959015
DOI:
10.1017/S136898001500138X
[Indexed for MEDLINE]

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