The data related to the underprivileged environment in a school is calculated with two benchmarks: the poverty index and the socio-economic index.
The poverty index corresponds to the proportion of families (with children) whose income is lower than the poverty threshold. This threshold is defined as the level of income according to which it is estimated that families use, in proportion with their income, 20% more than average for food, housing and clothes.
Socio-economic environment index
The socio-economic environment index corresponds to the proportion of families with children where the mother does not have a diploma, certificate or degree (two thirds of the index) and the proportion of households where parents were unemployed during the reference week of the Canadian census (one third of the index).