In contrast, another 6-year follow-up study among 2091 Chinese men and women, with 507 cases of type 2 diabetes, has shown a positive RBP4-diabetes association in the overall population, and the HR comparing the highest versus lowest quintile of RBP4 concentration was 1.47 (95% CI 1.07–2.03) [17]. Here, RBP4 is linked to diabetes mellitus.