Infant Mortality: Measure Definitions
 

Regardless of the measure used, infant mortality is the number of infants who died before they were 365 days old (from 0 through 364 days of age).

The differences in the three measures derive from three factors:

The three different measures are described below with their pros and cons.
Links:

For more information on this issue, please go to the NCHS web site.

Measure 1: Infant Mortality

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The first measure, Infant Mortality, provides the number of infant deaths during a year (regardless of birth year). The individual infant death records are not linked to the birth file. The number of births in the year are used as a denominator, however, in calculating the rate. The concise definition for Measure 1 is as follows: The number of infant deaths during the year per 1,000 live births during the same year.

PROS:

CONS:

Measure 1 1999 2000 2001
Death Record (numerator)   Infant deaths during 2000  
Birth Record   No linkage to birth record  
Denominator for Rate   Live births during 2000  
Availability of data file   At end of calendar year  

Measure 2: Birth-Death Linked Infant Mortality (Birth Cohort)

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The second measure, Birth-Death Linked Infant Mortality (Birth Cohort), provides the number of infant deaths that occurred among infants born during a particular year (regardless of the year of death). The individual infant death records ARE linked to the birth records, so that characteristics of the infant and mother may be analyzed. The concise definition for Measure 2 is as follows: The number of infant deaths among infants born in a given calendar year.

PROS:

CONS:

 

Measure 2 1999 2000 2001
Death Record (numerator)   Infant deaths among infants born in 2000 Infant deaths among infants born in 2001
Birth Record   Live births during 2000  
Denominator for Rate   Live births during 2000  
Availability of data file     Linked file complete at end of calendar year 2001

Measure 3: Birth-Death Linked Infant Mortality (Death Cohort, or Period File)

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The third measure, Birth-Death Linked Infant Mortality (Death Cohort, or Period File), provides the number of infant deaths that occurred among infants born during a particular year (regardless of the year of death). The individual infant death records ARE linked to the birth records, so that characteristics of the infant and mother may be analyzed. The concise definition for Measure 3 is the same as for Measure 1: The number of infant deaths during the year per 1,000 live births during the same year.

PROS:

CONS:

Measure 3 1999 2000 2001
Death Record (numerator)   Infant deaths during 2000  
Birth Record Birth records for infants who died in 1999 Birth records for infants who died in 2000  
Denominator for Rate   Live births during 2000  
Availability of data file   Linked file complete at end of calendar year 2000  




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