From the BBC, we find this short mention of the report conducted by the Oxford Poverty and Human Development Initiative.
The Indian states, including Bihar, Uttar Pradesh and West Bengal, have 421 million "poor" people, the study found.
This is more than the 410 million poor in the poorest African countries, it said.
The Multidimensional Poverty Index (MPI) measures a range of "deprivations" at household levels.
The measure assess a number of "deprivations" in households - from education to health to assets and services.