Plasma concentrations of cytokines responsible for Th1 lymphocyte activation (IL-3, IFN-γ, TNF-β) in HT patients were significantly elevated compared to healthy controls (↑36%, p ≤ 0.0001, ↑43%, p = 0.0001, ↑46%, p = 0.0028, respectively). Here, IL3 is linked to hematocrit.