Correcting the concentration index

J Health Econ. 2009 Mar;28(2):504-15. doi: 10.1016/j.jhealeco.2008.02.003. Epub 2008 Feb 16.


In recent years attention has been drawn to several shortcomings of the Concentration Index, a frequently used indicator of the socioeconomic inequality of health. Some modifications have been suggested, but these are only partial remedies. This paper proposes a corrected version of the Concentration Index which is superior to the original Concentration Index and its variants, in the sense that it is a rank-dependent indicator which satisfies four key requirements (transfer, level independence, cardinal invariance, and mirror). The paper also shows how the corrected Concentration Index can be decomposed and generalized.

MeSH terms

  • Data Interpretation, Statistical*
  • Health Status Disparities*
  • Humans
  • Models, Statistical
  • Social Class*