The interaction between Life expectancy and gross domestic product by countries

The article puts forward a hypothesis about the resultant nature of the indicator "life expectancy"; all other socio-economic indicators of the country's development are significant or insignificant factors. In order to test this hypothesis, the methodology of analysis of the countries of the world was described, an analytical and statistical analysis of life expectancy, gross domestic product per capita for the countries of the world was carried out; and on this basis, an assessment of the impact of real per capita GDP on life expectancy is given using the method of grouping, correlation and regression analysis. It is established that, in general, the relationship between them is positive and has a moderate character. It can be stated that real GDP per capita is an important, but most likely far from the most significant factor in ensuring high life expectancy, and further studies of the factors influencing life expectancy are required. At the same time, it was found that it is worth considering separately countries with high and very high levels and countries with medium and low levels of life expectancy and real GDP per capita, since the statistical relationship of the analyzed indicators in 2020 is somewhat different: in countries where GDP is above $13000, life expectancy is above 75 years, to increase life expectancy by 1 year, you need to increase GDP by $14000, and in countries below these values, an increase in GDP of only $5000 can lead to an increase in life expectancy by 1 year. The study also identified critical values (2020) for life expectancy and real GDP per capita. They respectively amounted to 69.20 years (first quartile), 75.50 years (median) and per capita GDP of $5050 and $13300 respectively. In this regard, it turns out that Russia belongs to countries with an average level of development in terms of life expectancy (LE - 72 years or the 158th place in the rating out of 227), in terms of GDP — to highly developed countries (per capita GDP — $26500 or the 70th place in the rating out of227). The example of Russia is a vivid illustration of the fact that the relationship between life expectancy and GDP is statistical and moderate.