Global Health Inequality: Comparing Inequality-Adjusted Life Expectancy over Time

Abstract

Background and objectives: Summary measures of overall health inequality are independent of group membership and enable international comparisons of distribution of health. We compare inequality between and within countries over time and identify normative issues underlying such comparisons. Methods: We used a set of modeled historical life tables for 193 World Health Organization member states from the years 1990, 2000 and 2008 and calculated inequality in age at death (Absolute Gini_H) and inequality-adjusted life expectancy (IALE). Results: Our calculations suggest that overall health inequalities in age at death have been decreasing in the period 1990–2008 in most countries of the world. Only 20 countries experienced increasing distribution in age at death. Simultaneously, overall life expectancy has increased in 85 per cent of all countries. Thus, the combined measure IALE has improved globally. The same overall trend of reduced health inequality applies to all groups of countries stratified by income level. Conclusion: Overall health inequalities, in addition to average health outcomes, could be reported regularly to monitor the health status of populations and the performance of health systems. We find, on normative grounds, the combined measure IALE to be preferable to measuring trends in inequality only. Likewise, we find the Absolute Gini_H to be preferable to Relative Gini_H.

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