For Kaposi sarcoma, the unadjusted HR was 1.56 (95% confidence interval [CI],1.52–1.60), decreasing to 1.46 (95% CI, 1.42–1.50) after adjusting for age, sex, and calendar year, and to 1.38 (95% CI, 1.35–1.42) after further adjusting for CD4 count. Here, CD4 is linked to Kaposi's sarcoma.