A closer look at the fertility behavior of the poor is important because of the extensive literature on the "replacement effect" of high infant mortality.

仔细研究穷人的生育行为是很重要的，因为有大量关于婴儿高死亡率的“替代效应”的文献。

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The document concludes that the high risk of infant, child, and maternal mortality is associated with pregnancies where mothers are too young, too old, or have already had several children.

该文件的结论是，婴儿、儿童和产妇死亡率高的风险与母亲年龄太小、太大或已经有几个孩子的怀孕有关。

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Novy-Hildesley explains, the doctor faced a high rate of infant mortality in the clinic.

VOA: standard.2009.12.18

Maternal mortality in America is particularly high in New York City, where extremes of wealth and poverty abound, says Deborah Kaplan, who oversees the Bureau of Maternal, Infant and Reproductive Health for New York City's health department.

VOA: standard.2010.06.23

Even with aggressive treatment, case mortality is high, reaching up to 25%.

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White males aged 50 years old who have no schooling beyond high school have mortality rates more than twice as high as those with college degrees.

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