Means (SD/GSD) of age, U-Cd, U-β2M, and U-NAG of 269 participants in county A (CA) and 225 participants in county B (CB) △.

△Values of U-Cd, U-β2M, and U-NAG are expressed as GM and GSD, and values of age were calculated by arithmetic mean and SD.*Compared with the control group, PU-β2M, urinary level of β2-microglobulin; U-NAG, urinary level of N-acetyl-β-D-glucosaminidase; U-Cd, urinary level of cadmium; GM, geometric mean; GSD, geometric standard deviation; SD, standard deviation.Means (SD/GSD) of age, U-Cd, U-β2M, and U-NAG of 269 participants in county A (CA) and 225 participants in county B (CB) △.