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.
More detailed results are included in S2 Table, including p values (<0.0001 for all countries). Missing bars represent results that were suppressed because they were based on fewer than 25 unweighted cases.
