Life expectancy as an indicator of environmental health.

Whether or not life expectancy at birth is related to the quality of life as expressed by global economical, environmental and nutritional measures is the primarily studied question in this article. Two models, set of independent variables and multivariate analysis was performed. An attempt to estimate the role of studied variables in overall life expectancy was done, too. A descriptive, ecological study design was used. The population of 156 countries have been taken into account, using data from published databases [7, 9]. Access to safe drinking water, per capita gross domestic product, literacy, calories available as percentage of needs and per capita public health expenditures were taken as exposure, and compared with life expectancy at birth. A linear regression model was used to estimate the role of different exposures on life expectancy at birth. A correlation matrix for all variables and life expectancy at birth is presented in the article. Literacy and access to safe drinking water are statistically significant variables (p < 0.001) also after fitting a linear regression model. The correlation coefficient for the linear model was 0.8823 (R2 = 0.7784). Shares of years of life from overall life expectancy attributed to studied variables were 28.06, 9.42, 2.04 and 1.93% for literacy, access to safe drinking water, GDP and calories available as percentage of needs, respectively.