O IDHM é obtido pela média geométrica dos três subíndices das dimensões que compõem o índice: longevidade, educação e renda.
In the MHDI, this dimension is measured by the life expectancy at birth.
The suggested demographic indicators in Atlas of Human Development I n Brazil - including life expectancy at birth - cannot be obtained directly from information in Demographic Censuses - thus, indirect techniques are used.
These methods - the technique for calculating the mortality rate of children and young people, the indicators of longevity and mortality, as well as the technique to calculate the total estimated fertility rate in total - were developed by William Brass (1968).
However, it should be noted that the techniques used required some adjustments for application in locations with small populations, such as in many municipalities or areas within municipalities. This adaptation was made by Professor José Alberto Magno de Carvalho, from the Center for Regional Development and Planning of (CEDEPLAR), at the Federal University of Minas Gerais (UFMG).
Furthermore, applying the methodology requires a standard mortality function. Ideally, it would be known as the mortality pattern of the particular population. When it is unknown, we use standard mortality tables or a mortality table for a given population, whose mortality pattern is considered similar to that of the population of the study. When calculating the mortality rates, especially for the Brazilian municipalities and UDH's, the output tables were used as a standard for levels of aggregation for their respective states.
The mortality tables for 1991 and 2000 were based on the Demographic Census of 1991 and on the National Research by Household Sample (PNAD) of the 1990s. These mortality tables for Brazilian states, developed by CEDEPLAR, were used as the standard. The tables that already included the results of the Demographic Census of 2010, estimated by CEDEPLAR, were also adopted for 2010