These results also demonstrated that, even in elderly
euthyroid subjects, plasma thyrotropin is independently
associated with lower risk of all-cause mortality. Plasma
FT4 levels were not significantly associated with all-cause
mortality in euthyroid subjects, although the point estimate
suggests a tendency toward an association between
higher FT4 and all-cause mortality in this group of subjects.
This could be in line with the findings of greater allcause
mortality in subjects with high FT4 in the overall
analysis of the whole cohort. Also, an inverse association
was found in euthyroid subjects between FT3 and all-cause
mortality, although it was not statistically significant.