Analysis of Site Heterogeneity and HIV Outcomes Across Rural and Urban Study Sites in Phidisa II - A Multi-site Randomized Controlled Antiretroviral Treatment Trial in a South African Military Cohort.

Background: Clinical trials frequently enroll subjects from different study sites. Few such studies provide analysis by individual site. Between 2004-2007, the South African Military Health System (SAMHS) established 6 research sites (3 urban, 3 rural) to build capacity for clinical research and HIV care.