Validation of a short food frequency questionnaire specific for iodine in UK females of childbearing age. Issue 6 (13th March 2014)

• Record Type: Journal Article
• Authors: Combet, E.; Lean, M. E. J.
• Is Part Of: Journal of human nutrition and dietetics. Volume 27:Issue 6(2014)
• Page Start: 599
• Page End: 605
• Publication Date: 2014-03-13
• Subjects: Dietetics -- Periodicals; Nutrition -- Periodicals; 613.205
• DOI: 10.1111/jhn.12219
• Languages: English
• ISSNs: 0952-3871

Abstract

<abstract abstract-type="main" id="jhn12219-abs-0001"> <title>Abstract</title> <sec id="jhn12219-sec-0001" sec-type="section"> <title>Background</title> <p>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.</p> </sec> <sec id="jhn12219-sec-0002" sec-type="section"> <title>Methods</title> <p>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.</p> </sec> <sec id="jhn12219-sec-0003" sec-type="section"> <title>Results</title> <p>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<sup>−1</sup>, 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 (<italic>r</italic><sub>s</sub> = 0.45, <italic>P</italic> = 0.002) and urinary excretion in μg L<sup>−1</sup> (<italic>r</italic><sub>s</sub> = 0.34, <italic>P</italic> = 0.025) but not in μg day<sup>−1</sup> (<italic>P</italic> = 0.316). The validity coefficients were 0.69, 0.66 and 0.52 for the food diaries, FFQ and urinary iodine excretion, respectively.</p> </sec> <sec id="jhn12219-sec-0004" sec-type="section"> <title>Conclusions</title> <p>The FFQ provides a rapid and reliable estimate of dietary iodine exposure to identify those population subgroups at risk of iodine deficiency.</p> </sec> </abstract>