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.
Smoothed discrete survival function curves showing the percentage of women with no second births up to 5 years after a first birth in two time periods 1993–1995 and 2003–2005 by nationality.
*The curves are statistically significant at the p < 0.001 level according to a log-rank test for equality of survivor functions.
