Intervening factors in the relationship between Life expectancy and GDP per capita

Previous research has established that there is a relationship between GDP per capita and Life expectancy. People who live in high income countries on the average live longer than people who live in low income countries. The purpose of this research was to explore the factors which are directly responsible for this relationship. A total of ten countries; five high income and five low income countries from across eight geographical regions of the World Bank were looked at as case studies.