Figure 1: (a) Subgrouping of study population on the basis of anti-retroviral therapy status into anti-retroviral therapy-Y (those receiving anti-retroviral therapy) and anti-retroviral therapy-naive subgroups. (b) Subgrouping of study population on the basis of CD4 counts into two subgroups, those with CD4 counts >200/ƒÊl and CD4 counts <200/ƒÊl