Figure 6
From: Exploratory spatial data analysis for the identification of risk factors to birth defects
Contents of twenty chemical elements in the worldwide lithosphere, human blood and soil samples from Shanxi province * Na, K, Ca, Mg, Fe were calculated for the mathematical average value for different contents of all soil types (%), and others were calculated for geometrical the average value for different soil type distribution areas (mg/kg). (Data source: Xiaolan AN, 1995; Chongwen SHI et al. 1996)