Conversely, the percentage of Tregs among the peripheral blood CD4+ T cells of the HT group was significantly lower than that of the NC group [(3.82 ± 1.48)% versus (5.61 ± 1.60)%; t = −4.599, P < 0.001] (Figure 1B; Table 2). The gene discussed is CD4; the disease is hematocrit.