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.
Blue denotes the epidural group; green denotes the IV group. Circles indicate individual data points, the horizontal bars denote the median durations, and the boxes denote the interquartile range.
