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.
Characteristics of the study population.
| Gender | 2015 | 2016 | 2017 | 2018 | 2019 | Total |
|---|---|---|---|---|---|---|
| % (n) | % (n) | % (n) | % (n) | % (n) | % (n) | |
| F | 51.5 (118) | 57.9 (390) | 61.4 (485) | 61 (486) | 56.4 (421) | 58.7 (1900) |
| M | 48.5 (111) | 42.1 (284) | 38.6 (305) | 39 (311) | 43.6 (325) | 41.3 (1336) |
