Relationship between iron status and thyroid function
In this study, Spearman’s rank correlation analysis revealed that both of SF and Hb were correlated with FT3, FT4, and TSH (all P < 0.01). Specifically, the results showed that the levels of SF were positively related to FT3 levels (r = 0.31, p < 0.01), T3 levels (r = 0.09, p < 0.05), FT4 levels (r = 0.28, p < 0.01), and T4 levels (r = 0.09, p < 0.05), and negatively related to TSH levels (r = -0.22, p < 0.01). In addition, as an anemia variable, Hb was involved in this statistical analysis. Hb was positively associated with the levels of T3, FT3, T4, and FT4, and negatively associated with TSH levels (all P < 0.01). Table S1 ,Figure 1 , andFigure S2summarized the correlation coefficients.