Univariate logistic regression identified several clinical variables that were significantly associated with UP (Table 2), such as BMI, DM, HCV infection, HD duration, undergoing HDF, Kt/Vurea, nPCR, non-anuria status, serum albumin levels, log iPTH levels, LDL levels, living in Taipei Basin, environmental NO2 levels, and environmental CO levels. This evidence concerns the gene ALB and diabetes mellitus.