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.
Multiple-group ITSA for comparisons on national monthly changes of labour neuraxial analgesia rates after the national policy. Notes: ITSA interrupted time-series analysis; adjustment for time-varying covariates: proportion of maternal age ≥ 35 years old, women with college education or above, number of antenatal visits ≥ 7 and women with antepartum complications or medical diseases
