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.
Extended power curves for two simulated clusters. Line 03160: cluster centered on the SU with zip code 03160 (northwest Auvergne); line 63112: cluster centered on the SU with zip code 63112 (central Auvergne). Both clusters were simulated with a relative risk of 6 and a baseline incidence of birth defects set to 2.26%.
