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This is partly because the data quality is improving over time but it also shows how frequent crises were in pre-modern times.
The consequence of the faster progress in former developing countries is that global health inequality has fallen since the 1950s.
For 1800 (red line), you see that the countries on the very left – Yemen, India, and others that are not labelled – had a child mortality rate higher than 50%. On the very right of the red line you see that in 1800 the best-off countries in the world had a child mortality rate higher than 30%: Every third child died in the countries with the health.