Neonatal mortality rate

This article describes a ratio measure. In the standard operationalization, the numerator of the measure is number of deaths to infants under 28 days of age (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 neonatal mortality rate (NMR) for a population is defined as the number of deaths to infants under 28 days of age for every 1000 live births. The measurement period is in principle variable but is typically taken to be a year.

The term neonatal here refers to "newly born."

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
infant mortality rate	within a year of being born
under 5 mortality rate	within 5 years of being born