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.