For children older than 1 year, the decline in mortality during the 20^th century was a result of improved sanitation and the introduction of modern medicines.

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The decline in mortality for children older than 1 year during the 20th century was significantly influenced by improvements in sanitation (such as cleaner water and better waste disposal systems) and the introduction of modern medicines, including antibiotics and vaccines, which helped control and prevent infectious diseases.

For Children Older Than 1 Year, the Decline in Mortality