The TSH-free thyroxine relationship: logarithmic--linear or error function?

In the paper by Hoermann et al. (1), a nonlinear model of the relationship between TSH and free thyroxine (fT4) based on the error function is described. They dismissed the log-linear relationship in favor of the latter supported by sophisticated curve fitting and statistical software that produced a comparatively superior fit to their dataset. Perhaps the… CONTINUE READING