The adjusted hazard ratio (aHR) for AIDS-related mortality for the lowest (vs middle) tertile of CD4:CD8 ratio was 1.28 (95% CI, .95–1.73) and for the highest (vs middle) tertile of CD8 was 1.36 (95% CI, 1.01–1.84) (Table 2). Here, CD8A is linked to AIDS.