CD4 and AIDS: The median nadir CD4+ T-cell count was 142 cells/mm3 (IQR, 35; 244 cells/mm3), the current CD4+ T-cell count was 237.5 (IQR, 79; 404), the baseline median CD4+/CD8+ ratio was 0.82 (IQR 0.58; 1.14) and 27% had a history of AIDS.