The number of deaths under 1 year per 1000 live births in a given year.
The number of infants who die per thousand births.
Number of deaths of infants under 1 year of age per 1,000 live births in a given geographic region or institution in a given period (usually 1 year).
The number of deaths of infants under one year of age per 1000 live births in a given year. Included in the IMR are the neonatal death rate (calculated from deaths occurring in the first four weeks of life) and post-neonatal death rate (from deaths in the remainder of the first year). Neonatal deaths are further subdivided into early (first week) and late (second, third, and fourth weeks). In prosperous countries neonatal deaths account for about two-thirds of infant mortalities, the majority being in the first week. The IMR is usually regarded more as a measure of social affluence than a measure of the quality of antenatal and/or obstetric care; the latter is more truly reflected in the perinatal mortality rate (the sum of stillbirths and first-week or neonatal deaths per 1000 total births).
The number of deaths of infants under one year of age. The IMR in any given year is calculated as the number of deaths in the first year of life in proportion to every 1,000 registered live births in that year. Along with perinatal mortality, it is accepted as one of the most important criteria for assessing the health of the community and the standard of the social conditions of a country.
The number of deaths per year of live-born infants less than 1 year of age divided by the number of live births in the same year. This value is usually expressed as deaths per 100,000 live births.