The relative validity and repeatability of an FFQ for estimating intake of zinc and its absorption modifiers in young and older Saudi adults

Alsufiani, Hadeil M., Yamani, Fatmah, Kumosani, Taha A., Ford, Dianne and Mathers, John C. (2015) The relative validity and repeatability of an FFQ for estimating intake of zinc and its absorption modifiers in young and older Saudi adults. Public Health Nutrition, 18 (06). pp. 968-976. ISSN 1368-9800

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Abstract

Objective To assess the relative validity and repeatability of a sixty-four-item FFQ for estimating dietary intake of Zn and its absorption modifiers in Saudi adults. In addition, we used the FFQ to investigate the effect of age and gender on these intakes. Design To assess validity, all participants completed the FFQ (FFQ1) and a 3 d food record. After 1 month, the FFQ was administered for a second time (FFQ2) to assess repeatability. Setting Jeddah, Saudi Arabia. Subjects One hundred males and females aged 20-30 years and 60-70 years participated. Results Mean intakes of Zn and protein from FFQ1 were significantly higher than those from the food record while there were no detectable differences between tools for measurement of phytic acid intake. Estimated intakes of Zn, protein and phytate by both approaches were strongly correlated (P<0·001). Bland-Altman analysis showed for protein that the difference in intake as measured by the two methods was similar across the range of intakes while for Zn and phytic acid, the difference increased with increasing mean intake. Zn and protein intakes from FFQ1 and FFQ2 were highly correlated (r>0·68, P<0·001) but were significantly lower at the second measurement (FFQ2). Older adults consumed less Zn and protein compared with young adults. Intakes of all dietary components were lower in females than in males. Conclusions The FFQ developed and tested in the current study demonstrated reasonable relative validity and high repeatability and was capable of detecting differences in intakes between age and gender groups.

Item Type:	Article
Uncontrolled Keywords:	Relative validity, Repeatability, FFQ, Zinc intake, Zinc-absorption modifiers, Saudi Arabia, Young and older adults
Subjects:	B400 Nutrition
Department:	Faculties > Health and Life Sciences > Applied Sciences
Depositing User:	Paul Burns
Date Deposited:	10 Dec 2018 17:16
Last Modified:	11 Oct 2019 18:17
URI:	http://nrl.northumbria.ac.uk/id/eprint/37158

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