Fig. 3

Smooth curve fitting model for nonlinear relationship of FT3/FT4 with VFA. The fitted curve is depicted by the red line, while the confidence interval is shown by blue lines. Adjusted for age, sex, FPG, uric acid, HbA1c, BMI, diabetes duration, dyslipidemia, hypertension, drinking status, smoking status, antihypertensive agents, lipid lowering agents, metformin therapy and GLP-1 RA therapy. Abbreviations: FT3, free triiodothyronine; FT4, free thyroxine; VFA, visceral fat area