IGHE and metabolic syndrome: Meanwhile, the inverse association between OCN and IgE was only observed in men without MetS (β = −0.017, 95%  CI = −0.027 to −0.008, and P < 0.001) and men with NGT (β = −0.019, 95%  CI = −0.029 to −0.008, and P < 0.001) or BMI < 27.5 kg/m2 (β = −0.015, 95%  CI = −0.025 to −0.006, and P = 0.020) or men without each individual component of MetS factors.