An official website of the United States government
Here's how you know
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.
Table 5a. Comparison of secondary outcomes between matched treatment groups during the outcome year (for the full version of this table, see Table 5b in online Supplemental Materials).