Association between Maternal Thyroxine and Risk of Fetal Congenital Heart Defects: A Hospital-Based Cohort Study

Figure 3

Association of the FT4 and FTT4P with the risk of congenital heart defects in stratification analyses. Abbreviations: FT4, free thyroxine; TT4, total thyroxine; FTT4, free-to-total thyroxine; and 95% CI, 95% confidence interval. ^aThyroid antibody positive was defined as any one positive of the three markers, including thyroperoxidase antibody (>34 IU/ml), thyroglobulin antibody (>115 IU/ml), or thyroid-stimulating hormone receptor antibody (>1.75 IU/L).