CD4 and tuberculosis: The zidovudine-based regimen (Log-Rank (Mantel-Cox) (p < 0.001)), baseline CD4 count (Log-Rank (Mantel-Cox) (p = 0.012)), sex (Log-Rank (Mantel-Cox) (p = 0.004)), baseline functional status (Log-Rank (Mantel-Cox) (p = 0.013)), baseline WHO stage (Log-Rank (Mantel-Cox) (p = 0.004)), and baseline TB symptoms (Log-Rank (Mantel-Cox) (p = 0.001)) were variables that were significantly associated with treatment failure.