# Infant mortality rate

From Demography

This article describes a ratio measure. In the standard operationalization, the numerator of the measure is number of infant deaths (view other ratio measures with this numerator) and the denominator of the measure is number of live births (view other ratio measures with this denominator). The denominator used for reporting is 1000. The measurement period is a variable.

The numerator counts the number of occurrences of an event during the measurement period.

The denominator counts the number of occurrences of an event.

## Definition

The **infant mortality rate** (**IMR**) for a population over a time interval (typically taken to be a year) is defined as the number of infant deaths (i.e., deaths within a year of birth) for every 1000 live births.

## Related terms

Term | Numerator is the number of deaths in the period ... |
---|---|

perinatal mortality rate | after 28 weeks of pregnancy while still a fetus, or within 7 days of birth if already born |

neonatal mortality rate | within 28 days of being born |

under 5 mortality rate | within 5 years of being born |