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.
Meta-analysis of trials showing effect of vitamin D supplementation in prevention of respiratory tract infections. Effect of vitamin D supplementation in prevention of respiratory tract infections. Random effect model (DerSimonian laird); Odds ratio = 0.582 (0.417 – 0.812) Z = - 3.185, P value = 0.001, test for heterogeneity t^2= 0.064
