title: Beyond the income inequality hypothesis and human health: a worldwide exploration.
abstract: OBJECTIVE
  To analyze whether the relationship between income inequality and human health is mediated through social capital, and whether political regime determines differences in income inequality and social capital among countries.
  
  
  METHODS
  Path analysis of cross sectional ecological data from 110 countries. Life expectancy at birth was the outcome variable, and income inequality (measured by the Gini coefficient), social capital (measured by the Corruption Perceptions Index or generalized trust), and political regime (measured by the Index of Freedom) were the predictor variables. Corruption Perceptions Index (an indirect indicator of social capital) was used to include more developing countries in the analysis. The correlation between Gini coefficient and predictor variables was calculated using Spearman's coefficients. The path analysis was designed to assess the effect of income inequality, social capital proxies and political regime on life expectancy.
  
  
  RESULTS
  The path coefficients suggest that income inequality has a greater direct effect on life expectancy at birth than through social capital. Political regime acts on life expectancy at birth through income inequality.
  
  
  CONCLUSIONS
  Income inequality and social capital have direct effects on life expectancy at birth. The "class/welfare regime model" can be useful for understanding social and health inequalities between countries, whereas the "income inequality hypothesis" which is only a partial approach is especially useful for analyzing differences within countries.
authors.affiliation: Centro de Investigación en Sistemas de Salud, Instituto Nacional de Salud Pública, Cuernavaca, México. ajidrovo@insp.mx
authors.forename: Alvaro J
authors.initials: AJ
authors.lastname: Idrovo
authors.forename: Myriam
authors.initials: M
authors.lastname: Ruiz-Rodríguez
authors.forename: Abigail P
authors.initials: AP
authors.lastname: Manzano-Patiño
mesh_terms: D014943:Global Health; D006304:Health Status; D006801:Humans; D007182:Income / Q000706:statistics & numerical data*; D038622:Internationality; D008017:Life Expectancy; D011056:Political Systems; D012944:Social Support; D012959:Socioeconomic Factors; D035502:Trust