Baseline population characteristics.

**PData shown are mean (standard deviation) values, except for percentages. Differences in continuous variables between the group with elevated and decreased serum TSH, respectively, and the group with normal TSH values were tested with independent sample t-tests, whereas differences between categorical variables were tested with chi2-tests.Baseline population characteristics.本次展示的PData均以均值（标准差）形式呈现，百分比数据除外。针对血清促甲状腺激素（Thyroid-Stimulating Hormone, TSH）升高组、降低组，分别与血清TSH正常组的连续变量组间差异采用独立样本t检验进行分析；分类变量的组间差异则通过chi2检验（chi2-test）进行分析。基线人群特征。