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CHARTing Health Information for Texas-->Rates & Formulas

Rates and ratios are calculated for a specific time period, typically a calendar year or a multiple of calendar years.

  • Abortion rate: Number of abortions obtained by women of all ages per 1,000 women 15 through 44 years of age:
(Number of legal induced terminations of pregnancy / Female population15-44 )* 1,000

  • Abortion ratio: Number of abortions per 1,000 live births:
(Number of legal induced terminations of pregnancy / Number of live births) * 1,000

  • Age-specific rate: Number of events occurring to a specified age group per 1,000 population of the specified age group:
(Number of Events / Number in age group) * 1,000
  • Case fatality rate: Number of deaths ascribed to a specific disease or condition per 1,000 reported cases of thesame disease or condition:
(Number of Deaths from a specified cause / Number in cases in the specified disease) * 1,000

  • Cause-specific death rate: Number of deaths due to a specific cause per 100,000 population:
(Number of deaths from a specified cause / Estimated midyear population) * 100,000
  • Crude birth rate: Number of live births per 1,000 population:
(Number of live births / Estimated midyear Population) * 1,000
  • Crude death rate: Number of deaths per 1,000 population:
(Number of deaths / Estimated midyear population) * 1,000
  • Crude divorce rate: Number of divorces per 1,000 population:
(Number of divorces / Estimated midyear population) * 1,000
  • Crude marriage rate: Number of marriages per 1,000 population:
(Number of marriages / Estimated midyear population) * 1,000
  • Fetal death rate: Number of fetal deaths per 1,000 live births plus fetal deaths:
(Number of fetal deaths / Live births + fetal deaths) * 1,000
  • Fetal death ratio: Number of fetal deaths per 1,000 live births:
(Number of fetal deaths / Number of live births) * 1,000
  • General fertillty rate (GFR): The total number of births in a given year to women of all ages divided by thefemale population ages 15 through 44. The quotient is multiplied by 1,000. The GFR is expressed as the numberof births in a calendar year for each 1,000 women of reproductive age:
(Number of live births / Female population 15-44) * 1,000
  • Infant death rate: Deaths of individuals less than 1 year of age per 1,000 live births:
(Number of infant deaths < 1 yr / Number of live births) * 1,000
  • Maternal death rate: Number of maternal deaths per 100,000 live births:
(Number of maternal deaths / Number of live births) * 100,000
  • Neonatal death rate: Number of individuals dying at less than 28 days of age per 1,000 live births:
(Number of infant deaths / Number of live births) * 1,000
  • Perinatal mortality ratio: Fetal deaths plus neonatal deaths per 1,000 live births:
(Fetal deaths + neonatal deaths / Number of live births) * 1,000
  • Perinatal mortality rate: Fetal deaths plus neonatal deaths per 1,000 live births plus fetal deaths
(Fetal deaths + neonatal deaths / Fetal deaths + Number of live births) * 1,000
  • Post-neonatal mortality rate: Number of infants dying at 28 to 365 days of age per 1,000 live births:
(Number of infant deaths 28 to 365 days / Number of live births) * 1,000

  • Pregnancy rate: Number of pregnancies to women of all ages (live births, fetal deaths, and induced abortions) ina given year per 1,000 women, ages 15-44 for a given year:
(live births + fetal deaths + induced terminations of pregnancy / female population 15-44) * 1,000
Total pregnancies are under reported since spontaneous abortions of less than 20 weeks gestation are generally unavailable or unreported.
  • Rate of natural increase: The difference (±) between the crude birth rate and the crude death rate
(Crude Birth Rate - Crude Death Rate)

This page was developed by Dr. Bill Spears, UTSPH, San Antonio Campus.

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