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.
Median serum 25(OH)D level by sex, age, and test month. The total number of subjects with 25(OH)D level by month in the age groups of 70s and ≥80s was <100 for several months. Darker to brighter lines represent younger to older age groups. Men aged ≥80 years were not tested in some months.
