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6个克山病区的土壤总硒和水溶性硒含量均值各为112及4.0ppb,而5个非病区的均值各为234及19.9ppb,病区土壤总硒和水溶性硒均显著低于非病区(P值分别为:p<0.05及p<0.01)。
The average total selenium and water-soluble selenium contents of soil in the six Keshan wards were 112 and 4.0 ppb respectively, while the average of five non-endemic areas was 234 and 19.9 ppb, respectively. In non-ward (P values were: p <0.05 and p <0.01).