Abstract
BackgroundThis study aimed to examine the longitudinal contributions of four political and socioeconomic factors to the increase in life expectancy in less developed countries (LDCs) between 1970 and 2004.MethodsWe collected 35 years of annual data for 119 LDCs on life expectancy at birth and on four key socioeconomic indicators: economy, measured by log10 gross domestic product per capita at purchasing power parity; educational environment, measured by the literacy rate of the adult population aged 15 years and over; nutritional status, measured by the proportion of undernourished people in the population; and political regime, measured by the regime score from the Polity IV database. Using linear mixed models, we analyzed the longitudinal effects of these multiple factors on life expectancy at birth with a lag of 0-10 years, adjusting for both time and regional correlations.ResultsThe LDCs' increases in life expectancy over time were associated with all four factors. Political regime had the least influence on increased life expectancy to begin with, but became significant starting in the 3rd year and continued to increase, while the impact of the other socioeconomic factors began strong but continually decreased over time. The combined effects of these four socioeconomic and political determinants contributed 54.74% - 98.16% of the life expectancy gains throughout the lag periods of 0-10 years.ConclusionsThough the effect of democratic politics on increasing life expectancy was relatively small in the short term when compared to the effects of the other socioeconomic factors, the long-term impact of democracy should not be underestimated.
Highlights
This study aimed to examine the longitudinal contributions of four political and socioeconomic factors to the increase in life expectancy in less developed countries (LDCs) between 1970 and 2004
This study aimed to investigate the longitudinal relationships between life expectancy and national developments in political regime in less developed countries (LDCs)
We followed the criteria for the “Developed World” category defined by the United States Census Bureau (USCB)
Summary
This study aimed to examine the longitudinal contributions of four political and socioeconomic factors to the increase in life expectancy in less developed countries (LDCs) between 1970 and 2004. The extension of life expectancy has always been a primary interest of medical research as well as an indicator of national public health profiles [1]. Changes in life expectancy can result from long-term changes in many factors, including political regime and socioeconomic status [5,6]. Political regime has been used as a distal determinant of life expectancy at the country level [7,8]. Labor market policies that promote higher employment rates and salary levels could contribute to better economic status and population health [8]. Investment in welfare and health policies– such as ensuring safe childbirth for mothers and babies, securing children’s right to nutrition, enhancing education of women and children, and increasing accessibility of public health and medical services–could benefit population health by redistributing resources to more people who are in need [8,11,12]
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