more recent times, higher mortality rates have been less tied to socio-economic levels within a given society, but have differed more between low and high-income countries. It is now found that national income, which is directly tied to standard of living within a country, is the largest factor in mortality rates being higher in low-income countries.

Preventable mortality

These rates are especially pronounced for children under 5 years old, particularly in lower-income, developing countries. These children have a much greater

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