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.
Number of inclusions and incidence of thyroid dysfunction requiring L-thyroxine supplementation. Abbreviations: FU1, follow-up visit at 18–24 months of corrected age; FU2, follow-up visit at 33–39 months of chronological age; LT4 (+), L-thyroxine supplementation; LT4 (−), no L-thyroxine supplementation.
