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.
Relationship between doses of vitamin D3 supplementation and net changes in serum 25OHD concentrations in RCTs by assay type. Legends: Each empty circle represents one study. The area of the circle is proportional to the inverse of the within-study variances. The larger the bubble is, the larger the sample size and the smaller the standard error of the changes in 25OHD.
Reprinted with permission from Newberry et al. [8].
