6.
Funnel plot of comparison: 1 Any supplements containing iron versus same supplements without iron or no treatment/placebo (no iron or placebo), outcome: 1.11 Preterm birth (less than 37 weeks of gestation) (ALL).
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.