CD4 at death was lowest for those who died of AIDS-related causes (median, 48 [IQR, 13–140], due partly to the use of CD4 in assigning causes of death), and highest for those who died of CVD (median, 360 [IQR, 221–608]) and unnatural causes (median, 340 [IQR, 150–560]) (Figure 2). Here, CD4 is linked to AIDS.