In 2015, the world's average life expectancy is 71.89. Good health in the rich countries and persistently bad health in those countries that remained poor. Over the last decades this global inequality decreased. No country in the world has a lower life expectancy than the countries with the highest life expectancy in 1800. Many countries that not long ago were suffering from bad health are catching up rapidly.
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Life expectancy has increased rapidly since the Age of Enlightenment.
In the early 19th century, life expectancy started to increase in the early industrialized countries
while it stayed low in the rest of the world. This led to a very high inequality in how health was distributed across the world.
In 2015, 74 over 214 countries in the world recorded lower than average sanitation percentage. Noteworthy is that it accounts for 45.8% of the world population. I.e, almost half the world is receiving under-averge sanitation.
Let's see the specific sanitation percentage with regard to life expectancy in the corresponding country. And also the income level (low - medium - high).
Looking at this histogram, we can see that most of the countries whose life expectancy under 60 have low sanitation level; meanwhile, ones whose 70 or higher have high sanitation level.
As can be seen from the map, there are areas with darker color, representing relatively lower level of sanitary. The areas are quite compact, locating around Africa and India. Therefore, it is evident that people in some regions in the world is generally suffering from worse hygiene condition, posing a need for immidiate actions to be done.