Question

In what purpose demographic index is used

Answer 1

Developed by GBD researchers and used to help produce these estimates, the Socio-demographic Index (SDI) is a summary measure of a geography's socio-demographic development. It is based on average income per person, educational attainment, and total fertility rate (TFR)

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Answer 2

GB of Disease Study 2015 is maintained by Institute for Health Metrics and Evaluation which depicts burden of diseases and risk factors at global, regional, national, territorial countries.

Socio-demographic Index (SDI) is a summary calculations of geography's socio-demographic development and innovation.  

Its depends on net income every persons educational attainment and total fertility rate.