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Multilingual Demographic Dictionary, second unified edition, English volume

Separation factor

Multilingual Demographic Dictionary, second unified edition, English vol.
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Separation factor  (SEPARATION factor)


The ratios of deaths under one year of age 1, of deaths of less than 28 days, and of deaths of less than one week, occurring in a year, to the number of live births of the same year give respectively the infant mortality rate 2, the neo-natal mortality rate 3 and the early neo-natal mortality rate 4. These rates are generally expressed per one thousand live births. When deaths are cross-classified by age and year of birth, it is possible to divide the deaths under one year by the births in the two cohorts to which they belong. The resulting index is an adjusted infant mortality rate 5 equivalent to a probability of dying before age one 5. In the absence of such information separation factors 6 may be estimated, which divide infant deaths into those occurring to infants born in the current calendar year and to infants born in the previous calendar year. More...