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.
(A) Forest plot of the SABA usage days between the macrolides group and the placebo group. (B) Forest plot of subgroup analysis of SABA usage days by the type of macrolides.
Abbreviations: SABA, short-acting β2-agonist; std diff, standardized difference.
