IL22 and hematocrit: Further analysis revealed that the mean optical density (MOD) of anti-IL-22 staining was positively correlated with the levels of serum TPOAb (r = 0.9345, p<0.0001) and the percentages of circulating Th22 cells (r = 0.9165, p<0.0001) in the HT patients (Fig. 5B).