1 Southwestern Medical School, Dallas, Texas
The values obtained by Kundstadter and associates vary rather markedly from those obtained by ourselves and others. They found elevated T-3-RBC uptake at various periods throughout childhood, while our results showed an elevation only in early infancy. Even there Kundstadter et al. showed a much greater change than we did.
Our work was in part misrepresented by the authors, when they stated that we did not distinguish among various age groups. We divided our infants under 18 months into a number of discrete groups. We grouped together children 1
to 15 years of age because our data indicated these children represented a homogeneous group with respect to T-3 uptake. Indeed, observation of the authors' data for children 2 to 13 years suggests no real statistical difference among the three separate groups into which they have been divided.