CD4 and AIDS: Adjusted analysis showed younger age, high initial CD4 cell count (>500 cells/mm3) or ever having a CD4 cell count >500/mm3, and more recent calendar year of ART commencement were all associated with reduced hazards for AIDS and death, while older age, low initial CD4 cell count (<200/mm3), ever having a CD4 count <200/mm3 (before or during treatment) and high initial viral load (>5 log10) were associated with increased risk of AIDS and death.