Fig. 1.
Combinations of activity restriction among women with a cervical length less than 30 mm. The numbers show the number of women who experienced each type or combination of restrictions.
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.