The association between body mass index and subclinical thyroid dysfunction in different sexes of Chinese

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Abstract

Objective: To study subclinical thyroid dysfunction (SCTD)-subclinical hyperthyroidism and subclinical hypothyroidism-in Chinese patients in relation to body mass index (BMI) and to determine whether a difference between sexes exists. Methods: This cross-sectional study recruited 13,503 healthy participants (8,345 male, 5,158 female) who participated in a health examination. Clinical data, including anthropometric measurements and serum parameters, were collected. The association between SCTD and the BMI of each sex was analyzed separately by stratifying the data by SCTD type and regarding BMI as a categorical or as a continuous variable in different models. The odds ratio of SCTD was calculated from binary logistic regression models. Results: The prevalence of both subclinical hyperthyroidism and subclinical hypothyroidism was significantly lower in males compared to females. For subclinical hypothyroidism, we found no significant association with BMI in females. In males, there was a significant negative relationship between BMI and subclinical hypothyroidism. For subclinical hyperthyroidism, we did not find any significant relationship with BMI in either sex after stratifying the data and treating BMI as a categorical or as a continuous variable. Conclusion: For subclinical hyperthyroidism, no significant effect was found in either sex. For subclinical hypothyroidism, high BMI was associated with lower rates of subclinical hypothyroidism in males, and no significant correlation was found in females. The mechanism of this sex-specific association between BMI and SCTD needs more verification.

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Pan, Z., Huang, C., Meng, Z., Zhang, W., Li, Y., Yu, X., … Zhao, L. (2019). The association between body mass index and subclinical thyroid dysfunction in different sexes of Chinese. Endocrine Practice, 25(11), 1166–1175. https://doi.org/10.4158/EP-2018-0612

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