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Association High-Iodine-Containing Seaweed Soup Consumption after Birth and Subclinical Hypothyroidism in Korean Women: Korea National Health and Nutrition Examination Survey IV (2013–2015)
Int J Thyroidol 2019;12(2):105-112
Published online November 30, 2019;  https://doi.org/10.11106/ijt.2019.12.2.105
© 2019 Korean Thyroid Association.

Hyunsam Kim1, Ha Ni Lee2 and Jeonghoon Ha1

Division of Endocrinology and Metabolism, Department of Internal Medicine, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea1, Seoul, Health Promotion Center, Department of Internal Medicine, Bobath Memorial Hospital2, Seongnam, Korea
Correspondence to: Jeonghoon Ha, MD, Division of Endocrinology and Metabolism, Department of Internal Medicine, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seocho-gu, Seoul 06591, Korea
Tel: 82-2-2258-6372, Fax: 82-2-599-3589, E-mail: 3002041@catholic.ac.kr
Received February 11, 2019; Revised July 5, 2019; Accepted July 8, 2019.
This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Background and Objectives: This study was to investigate the association between the previous history of seaweed intake after childbirth and subclinical hypothyroidism (SCH) occurrence in Korean women based on the latest nationally representative epidemiological survey data, the Sixth Korea National Health and Nutrition Examination Survey (KNHANES VI).
Materials and Methods: This study used data from KNHANES VI, a cross-sectional, nationally representative survey that comprises a health interview survey, health examination survey, and nutrition survey. Of the initial 22,948 Korean participants enrolled in KNHANES VI, 2,046 women were selected for this analysis. To examine SCH, the thyroid-stimulating hormone (TSH) reference range was defined using a population-based TSH range.
Results: Subclinical hypothyroidism was increased in those who consumed seaweed soup after childbirth, but this was not significant (OR 1.3, CI: 0.80-2.13, p=0.293). However, the odd ratio for SCH differed according to the duration of seaweed soup consumption. When seaweed soup was consumed within 1 week after birth, the OR was increased in the crude model (OR 2.61, CI: 1.39-4.89, p=0.002), but this was no longer significant in the adjusted model (OR 1.89, CI: 0.79-4.50).
Conclusion: The notable finding from this study is that the previous history of excessive seaweed consumption during post-partum period may not be a risk factor for SCH in Korean women.
Keywords : Subclinical hypothyroidism, Iodine, Seaweed


November 2019, 12 (2)