CD4 and AIDS: In multivariate analysis, the following variables were associated with in-hospital mortality: older age (p=0.02); WHO clinical stage 3 (p=0.003) and 4 (p=0.002) versus stage 1 or 2; CD4 count <50 (p<0.0001), 50–200 (p=0.02) and unknown (p<0.0001) versus CD4 count >200/mm3; AIDS as the underlying cause of hospitalization (p=0.0005) and non-AIDS-defining infections (p=0.01) versus non-specific illnesses.