Bone Mineral Density Substudy

The purpose of this study is to quantify the relative contributions of HIV and of antiretroviral treatment (ART) for HIV on rates of bone mineral density (BMD) loss among HIV-infected individuals who are antiretroviral naïve with CD4 cell counts above 500 cells/mm3. This will be achieved by comparing changes in hip and spine BMD from baseline through follow-up between the early ART and the deferred ART groups of the START study.