Surface Water Quality and Infant Mortality in China
研究发现中国地表水污染对婴儿死亡率有显著的非单调影响：水质恶化时，婴儿死亡率先升后降，中等污染水平最危险。
Surface water pollution has a significant, nonmonotonic effect on the infant mortality rate in China. As surface water quality deteriorates, the infant mortality rate first increases and then decreases. Thus, moderate levels of pollutionin the absence of good information on water quality-are the most dangerous.