Unadjusted Cox Proportional Hazard Ratios for Mortality after Initiating HIV Treatment.

Absolute CD4, hemoglobin and weight-for-age Z-score were treated as continuous variables. Reference groups for the binary variables include: Age <3 years – reference age 3–18 years; CD4 <10% - reference CD4 >10%, Opportunistic infection includes children with the presence of candidiasis, Kaposi's sarcoma, Pneumocystis jiroveci pneumonia, cryptococcosis, toxoplasmosis, or cryptosporidiosis, while the reference group did not have any of these opportunistic infections; Tuberculosis at or after initiation or HIV therapy – reference was the absence of HIV-tuberculosis co-infection; chronic diarrhea – reference children not documented to have chronic diarrhea.