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.
The forest plot graphically depicts the individual results included in meta-analysis. Sizes of the boxes are proportional to the weight assigned in calculating the fixed-effects sRR, where weight was assigned inversely to variance. Results to the left of relative risk = 1 indicate a lower risk of preterm birth with zinc supplementation. Events indicate the number of births delivered preterm (gestational age < 37 weeks). RR, relative risk; CI, confidence interval.
