IL33 and cryohydrocytosis: Further analysis revealed that the levels of serum sST2 were significantly higher in CHC and SR-CHC patients than that in HC (P = 0.004, P = 0.041, resp., Figure 2), but there was no significant correlation between the levels of serum IL-33 and sST2 in those subjects (r = −0.050, P = 0.678).