IL2 and obstructive sleep apnea syndrome: The levels of IL-2 [F(2,138) = 3.211, p = 0.043] and IFN-γ [F(2,138) = 3.987, p = 0.021] were significantly higher among patients with OSAHS than among the controls; post hoc testing indicated higher levels among those with AHI ≥15 than among those with AHI <15 (Fig. 1b).