Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Mean heart rate according to quartiles of FT3, TT3, and TSH (within reference range for TSH). A higher quartile of FT3 is associated with a gradual increase in heart rate; a higher quartile of TSH is not. p-Values result from analysis of variance (overall difference between categories). Error bars represent standard error of the mean. T3, triiodothyronine; FT3, free T3; TT3, total T3.
