CD4 and syphilis: Table 4 summarized comparisons of characteristics between HIV/AHC cases and matched HIV/non-AHC controls. In bivariate analysis, HIV/AHC cases were significantly associated with a higher last CD4 count and a syphilis report during the observation period (Table 4). In the conditional logistic regression model, factors independently associated with HIV/AHC were having the last syphilis report ≤6 months (recent syphilis) (aOR, 9.9; 95% CI, 3.9–25.2) and having the last syphilis report >6 months (aOR, 2.8; 95% CI, 1.2–6.5) during the observation period (Table 5).