Which factor has the greatest impact on increasing life expectancy at birth?

Question

Quizplus · Accepted Answer

Prevention of illness that leads to death in infancy and early childhood has the greatest impact on increasing life expectancy at birth as it reduces early mortality rates. This has been demonstrated by historically high infant mortality rates leading to lower life expectancies at birth, and improvements in healthcare and sanitation leading to significant increases in life expectancy. The other factors listed can also contribute to increases in life expectancy, but to a lesser extent.

Which Factor Has the Greatest Impact on Increasing Life Expectancy