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.
Fertility and fertility correlations over time after the manifestation of a new low-fertility lifestyle (model 1). Dashed lines show fertility, solid lines show observed fertility correlations. The code to produce this figure can be found in electronic supplementary material, appendix B. (Online version in colour.)
