Evaluation of a semi-quantitative food frequency questionnaire to estimateiodine intake

Citation
Lb. Rasmussen et al., Evaluation of a semi-quantitative food frequency questionnaire to estimateiodine intake, EUR J CL N, 55(4), 2001, pp. 287-292
Citations number
23
Categorie Soggetti
Endocrynology, Metabolism & Nutrition","Endocrinology, Nutrition & Metabolism
Journal title
EUROPEAN JOURNAL OF CLINICAL NUTRITION
ISSN journal
09543007 → ACNP
Volume
55
Issue
4
Year of publication
2001
Pages
287 - 292
Database
ISI
SICI code
0954-3007(200104)55:4<287:EOASFF>2.0.ZU;2-O
Abstract
Objective: To evaluate a food frequency questionnaire (FFQ) used to assess the dietary intake of iodine. Design: The iodine intake determined by the FFQ was compared with 4-day die tary records and with iodine excretion in 24 h urine samples in a subgroup of participants in a cross-sectional study of iodine intake and thyroid dis eases in Denmark. Furthermore, the intake of fish determined from the FFQ w as compared with the intake of fish from a simple record kept for 3 months. Subjects: Women aged 25-30 y and 60-65 y. Results: Median iodine intake was similar when determined from the FFQ and from dietary records and the correlation between these measures was 0.52 (P < 0.001). Iodine intake was higher than iodine excretion (P < 0.001). The cross-check questions in the FFQ (for example the question 'How often did y ou get any kind of fish?') underestimated the intake. In contrast, the inta ke of a specific fish tended to be overestimated by the FFQ when compared w ith the 3 month record of fish intake. Conclusion: The FFQ can be used to classify subjects into low and high iodi ne intake groups, but the level of iodine tends to be overestimated. Sponsorship: The Danish Medical Foundation and the 1991 Pharmacy Foundation .