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.
Causal structure for follow-up of a clinic-based cohort of human immunodeficiency virus-infected patients initiating antiretroviral therapy (ART) in Africa. The relation of interest is the predictive value of sex on vital status after adjustment for other pretherapy patient characteristics. This parameter is of practical prognostic importance to providers at the time of ART initiation.
