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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He continued by explaining the theory that parents will have more children when infant mortality is high, so as to ensure that several children will survive to take care of them as they grow old.

他继续解释他的理论，父母们将会有更多孩子当婴儿死亡率是高的，以便确保若干孩子将能生存下来去照顾他们当他们变老了。

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In fact, no one dies of old age; "old age" is not a disease, nor is it a cause of mortality.

事实上，没人是因为年老而死亡的，“年老”不是病，也不是导致死亡的原因。

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But it has brought the benefit of a longer and better life, and not just for the old: since 1980, infant mortality has fallen by 45%.

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"Maybe it's because it makes people think about their mortality, or it makes them feel old, " Ramachandran said.

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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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