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.
Percentages of participants responding to Web and paper questionnaires during the 2003, 2005, and 2007 follow-up cycles, by e-mail availability, Black Women's Health Study, 2003–2008. Results are presented for all participants who either A) provided study investigators with an active e-mail address or B) did not.
