Donor age and BMI trends for the hormonogenic competence endpoints. Simple linear regression analyses of age (years) (A–C) and BMI (D–F) relative to the Tx-2 treatment group variables for hormone synthesis (A and D) thyroglobulin, (B and E) T4, and (C and F) T3. The dashed lines represent the 95% confidence interval of the regression line. The regression model fits are represented by the regression coefficient of determination (r²).