Figure 2. GAM assess the shape of relatioships between BMI (kg/m2) and thyroid hormones. A, relationship of TSH and BMI without adjustment; B, relationship of TSH and BMI with adjustment for age and sex; C, relationship of FT3 and BMI without adjustment; D, relationship of FT3 and BMI with adjustment for age and sex; E, relationship of FT4 and BMI without adjustment; F, relationship of FT4 and BMI with adjustment for age and sex. The shaded area of the trends are the 95% confidence intervals (95%CI) of the fitted smoothing splines.
