The primary reason for the vast increase in life expectancy in developed countries in the 20th century is universal clean drinking water and very high levels of public and person hygiene. These two improvements account for probably 80% of the life expectancy improvements. Overall, life expectancy has increased due to 6 major factors (from most to least importance):
-Clean drinking water
-Universal sanitation
-Significantly improved nutrition, particularly during infancy and childhood
-Vaccination against most common epidemic diseases
-Access to high-quality trauma (accident and emergency) care
-Improved drugs (particularly, antibiotics)
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