These years a group of persons participated in a population study and got a series of thyroid blood tests.
Look at these pages: https://wwwn.cdc.gov/Nchs/Nhanes/2011-2012/THYROD_G.htm#Analytic_Notes and here: https://wwwn.cdc.gov/Nchs/Nhanes/Search/DataPage.aspx?Component=Laboratory&Cycle=2011-2012
The NHANES Studies have been running for many years. On the following pages, we will publish patterns found in the figures.