Prevalence and risk factors of hypothyroidism after universal salt iodisation: a large cross-sectional study from 31 provinces of China

Objectives To investigate the prevalence and risk factors of hypothyroidism after universal salt iodisation for 20 years in mainland China.Design Nationwide, cross-sectional survey.Setting and participants The Thyroid Disorders, Iodine Status and Diabetes epidemiological study included adults from 3...

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Main Authors: Yongze Li, Di Teng, Xiaoguang Shi, Weiping Teng, Zhongyan Shan, Jiashu Li, Xiaochun Teng
Format: Article
Language:English
Published: BMJ Publishing Group 2023-02-01
Series:BMJ Open
Online Access:https://bmjopen.bmj.com/content/13/2/e064613.full
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author Yongze Li
Di Teng
Xiaoguang Shi
Weiping Teng
Zhongyan Shan
Jiashu Li
Xiaochun Teng
author_facet Yongze Li
Di Teng
Xiaoguang Shi
Weiping Teng
Zhongyan Shan
Jiashu Li
Xiaochun Teng
author_sort Yongze Li
collection DOAJ
description Objectives To investigate the prevalence and risk factors of hypothyroidism after universal salt iodisation for 20 years in mainland China.Design Nationwide, cross-sectional survey.Setting and participants The Thyroid Disorders, Iodine Status and Diabetes epidemiological study included adults from 31 provinces of China. Data included demographic, physical characteristics, urine, serum thyroid-stimulating hormone (TSH), thyroid-peroxidase antibody (TPOAb), thyroglobulin antibody (TgAb) and thyroid ultrasonography. Subclinical hypothyroidism (SCH) was classified into severe SCH (TSH >10 mU/L) and mild SCH (TSH 4.2–9.9 mU/L). A total of 78 470 (38 182 men and 40 288 women) participants were included in the final analysis.Results The prevalence of hypothyroidism was 13.95%. The prevalence rates of overt hypothyroidism (OH) and SCH were 1.02% and 13.93%, which mild SCH was significantly higher than severe SCH (12.18% vs 0.75%). Prevalence was higher in women than in men, and this gender difference was noted among all age groups. The prevalence of mild SCH, severe SCH and OH increases by 1.16%, 1.40% and 1.29% for every 10 years older. TPOAb or/and TgAb positive were significantly associated with OH and severe SCH (OR 15.9, p<0.001). However, SCH was positively correlated with increased urine iodine concentration, but this correlation was only in antibody-negative female patients. In non-autoimmune and male populations, there was a U-shaped relationship between severe SCH and OH and urine iodine concentration.Conclusions Mild SCH is the most common form of hypothyroidism, which is related to iodine intake. Severe SCH is more similar to OH which autoimmune is the main cause. The various effects of iodine on hypothyroidism depend on thyroid autoimmune and gender.
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spelling doaj-art-3d4077be6e524e379aacf63e02f43ad62025-08-20T03:16:27ZengBMJ Publishing GroupBMJ Open2044-60552023-02-0113210.1136/bmjopen-2022-064613Prevalence and risk factors of hypothyroidism after universal salt iodisation: a large cross-sectional study from 31 provinces of ChinaYongze Li0Di Teng1Xiaoguang Shi2Weiping Teng3Zhongyan Shan4Jiashu Li5Xiaochun Teng6Department of Endocrinology and Metabolism and the Institute of Endocrinology, NHC Key Laboratory of Diagnosis and Treatment of Thyroid Diseases, First Hospital of China Medical University, Shenyang, Chinasenior lecturerprofessorprofessorprofessorDepartment of Endocrinology and Metabolism, Institute of Endocrinology, NHC Key Laboratory of Diagnosis and Treatment of Thyroid Diseases, The First Hospital of China Medical University, Shenyang, Liaoning, ChinaDepartment of Endocrinology and Metabolism, Institute of Endocrinology, NHC Key Laboratory of Diagnosis and Treatment of Thyroid Diseases, The First Hospital of China Medical University, Shenyang, Liaoning, ChinaObjectives To investigate the prevalence and risk factors of hypothyroidism after universal salt iodisation for 20 years in mainland China.Design Nationwide, cross-sectional survey.Setting and participants The Thyroid Disorders, Iodine Status and Diabetes epidemiological study included adults from 31 provinces of China. Data included demographic, physical characteristics, urine, serum thyroid-stimulating hormone (TSH), thyroid-peroxidase antibody (TPOAb), thyroglobulin antibody (TgAb) and thyroid ultrasonography. Subclinical hypothyroidism (SCH) was classified into severe SCH (TSH >10 mU/L) and mild SCH (TSH 4.2–9.9 mU/L). A total of 78 470 (38 182 men and 40 288 women) participants were included in the final analysis.Results The prevalence of hypothyroidism was 13.95%. The prevalence rates of overt hypothyroidism (OH) and SCH were 1.02% and 13.93%, which mild SCH was significantly higher than severe SCH (12.18% vs 0.75%). Prevalence was higher in women than in men, and this gender difference was noted among all age groups. The prevalence of mild SCH, severe SCH and OH increases by 1.16%, 1.40% and 1.29% for every 10 years older. TPOAb or/and TgAb positive were significantly associated with OH and severe SCH (OR 15.9, p<0.001). However, SCH was positively correlated with increased urine iodine concentration, but this correlation was only in antibody-negative female patients. In non-autoimmune and male populations, there was a U-shaped relationship between severe SCH and OH and urine iodine concentration.Conclusions Mild SCH is the most common form of hypothyroidism, which is related to iodine intake. Severe SCH is more similar to OH which autoimmune is the main cause. The various effects of iodine on hypothyroidism depend on thyroid autoimmune and gender.https://bmjopen.bmj.com/content/13/2/e064613.full
spellingShingle Yongze Li
Di Teng
Xiaoguang Shi
Weiping Teng
Zhongyan Shan
Jiashu Li
Xiaochun Teng
Prevalence and risk factors of hypothyroidism after universal salt iodisation: a large cross-sectional study from 31 provinces of China
BMJ Open
title Prevalence and risk factors of hypothyroidism after universal salt iodisation: a large cross-sectional study from 31 provinces of China
title_full Prevalence and risk factors of hypothyroidism after universal salt iodisation: a large cross-sectional study from 31 provinces of China
title_fullStr Prevalence and risk factors of hypothyroidism after universal salt iodisation: a large cross-sectional study from 31 provinces of China
title_full_unstemmed Prevalence and risk factors of hypothyroidism after universal salt iodisation: a large cross-sectional study from 31 provinces of China
title_short Prevalence and risk factors of hypothyroidism after universal salt iodisation: a large cross-sectional study from 31 provinces of China
title_sort prevalence and risk factors of hypothyroidism after universal salt iodisation a large cross sectional study from 31 provinces of china
url https://bmjopen.bmj.com/content/13/2/e064613.full
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