PDIA4 and metabolic syndrome: In multivariate logistic regression analysis adjusted for age and sex, serum PDIA4 levels in the 2nd and 3rd tertiles (compared with the bottom tertile) were significantly associated with a higher odds of having MetS (OR 2.41 (95% CI 1.62–3.57) and 9.16 (95% CI 5.94–14.13), respectively) (Table 2).