Percentage of persons in households where the level of expenditures (including a value of free-of-charge articles as well as natural consumption) was lower than the adopted extreme poverty risk threshold (subsistence minimum, setting the level of satisfaction of needs below which occurs a biological threat to life and psychophysical human development.

Formerly referred to as: "Extreme poverty incidence rate" or "Extreme poverty rate".

The starting point adopted for constituting the extreme poverty risk threshold is subsistence minimum estimated by the Institute of Labour and Social Studies for the 1-person employees' household and then this value is multiplied by the number of persons in the household according to the original OECD equivalence scale.

The rate is calculated on a basis of the Household Budget Survey.