All subjects were divided into four groups according to their cumulative cadmium exposure indexes: Cd-B • t (Cd in blood in mg/l • years of exposure ) ( index 1) or Cd-A • t (Cd in air mg/m3 • years of exposure) (index 2).
All subjects were divided into four groups accordingto their cumulative cadmium exposure indexes: Cd-B • t (Cd in blood in mg/l • years of exposure ) ( index 1) or Cd-A • t(Cd in air mg/m3 • years of exposure) (index 2).