Before PSM, a comparison between 59 HIV-infected ICH patients and 180 HIV-infected without ICH patients identified seven risk factors for ICH: drug abuse-related HIV-infected, hypertension, elevated white blood cell count (WBC), elevated red blood cell count (RBC), prolonged PT, elevated serum TG levels and decreased CD4+ cell count (Table 2). This evidence concerns the gene CD4 and hypertensive disorder.