Validation of a short food frequency questionnaire specific for iodine in UK females of childbearing age.
In: Journal of Human Nutrition & Dietetics, Jg. 27 (2014-12-01), Heft 6, S. 599-605
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Zugriff:
Background Widespread subclinical iodine insufficiency has recently been reported in Europe, based on urinary iodine using World Health Organization/ Food and Agriculture Organization criteria, in particular among young women. Although urinary iodine concentration ( UIC) is a useful measurement of the iodine status in a population, it does not provide an insight into the habitual iodine intake of this population. This is compounded by the fact that very few iodine-specific food frequency questionnaires ( FFQ) have been validated so far. The present study aimed to develop and validate a new, simple, rapid survey tool to assess dietary iodine exposure in females of childbearing age. Methods Iodine was measured in a duplicate 24-h urine collection. Iodine intake was measured with duplicate 4-day semi-quantitative food diaries and the FFQ. Correlation, cross-classification and Bland-Altman analyses were used to estimate agreement, bias and the reliability of the method. The triangular (triad) method was used to calculate validity coefficients. Results Forty-three women, aged 19-49 years, took part in the validation of the 17-items FFQ. Median ( interquartile range) UIC was 74 (47-92) μg L −1 , which is indicative of mild iodine insufficiency. The FFQ showed good agreement with food diaries with respect to classifying iodine intake (82% of subjects were classified in the same or adjacent quartile). The FFQ was moderately correlated with the food diaries ( r s = 0.45, P = 0.002) and urinary excretion in μg L −1 ( r s = 0.34, P = 0.025) but not in μg day −1 ( P = 0.316). The validity coefficients were 0.69, 0.66 and 0.52 for the food diaries, FFQ and urinary iodine excretion, respectively. Conclusions The FFQ provides a rapid and reliable estimate of dietary iodine exposure to identify those population subgroups at risk of iodine deficiency. [ABSTRACT FROM AUTHOR]
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Titel: |
Validation of a short food frequency questionnaire specific for iodine in UK females of childbearing age.
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Autor/in / Beteiligte Person: | Combet, E. ; Lean, M. E. J. |
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Zeitschrift: | Journal of Human Nutrition & Dietetics, Jg. 27 (2014-12-01), Heft 6, S. 599-605 |
Veröffentlichung: | 2014 |
Medientyp: | academicJournal |
ISSN: | 0952-3871 (print) |
DOI: | 10.1111/jhn.12219 |
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