Figure 3. Mean third trimester serum 25-hydroxyvitamin D concentration in Boston exceeds that in Mongolia.
Histogram of 25-hydroxyvitamin D by study location. Sample size: Boston=206, Mongolia=390.
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.