Vital Statistics Formulas

 

 

 

(Crude) live birth rate =

 

Total number of live births

Total population

 

 

X

 

 

 

1,000

 

 

 

(Crude) death rate =

 

Total number of deaths

Total population

 

 

 

X

 

 

 1,000

 

(Crude) marriage rate =

Total number of marriages

Total population

 

 

X

 

1,000

 

 

(Crude) divorce rate =

Total number of divorces & annulments

Total population

 

 

 

X

 

 

1,000

 

 

Cause-specific mortality rate =

Number of deaths from a specific cause

Total population

 

 

 

X

 

 

100,000

 

 

Maternal mortality rate =

 

 

Number of maternal deaths

Total number of live births

 

 

X

 

 

100,000

 

Neonatal mortality rate =

 

Number of neonatal deaths

Total number of live births

 

 

X

 

1,000

 

Postneonatal mortality rate =

 

Number of postneonatal deaths

Total number of live births

 

X

 

1,000

 

Infant mortality rate =

 

Number of infant deaths

Total number of live births

 

 

X

 

1,000

 

Fetal mortality rate =

Number of fetal deaths

Total number of fetal deaths (stillbirths) plus live births

 

 

X

 

1,000

 

Induced abortion ratio =

Number of induced abortions

Total number of live births

 

 

X

 

100

 

 

Percentage of live births to unmarried women =

 

Number of children born alive to unmarried women

Total number of live births

 

 

 

X

 

 

100

 

Percentage of low birthweight births =

 

Number of low birthweight infants born alive

Total number of live births

 

 

 

X

 

 

1,000

 

Note: Crude divorce rates are tabulated using occurrence data rather than residence data.  Crude marriage rates are tabulated using both occurrence and residence data. Race-specific rates/percents/ratios use the same formula as above, except that both numerator and denominator are for the stated race.