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CHARTing Health Information: Rates & Formulas

This Web site has been designed to provide a comprehensive collection of links to publicly available health and health determinants data. While the emphasis is on the state of Texas, there are links to sites that cover all of the U.S.

Health Data 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 the same 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 fertility rate (GFR): The total number of births in a given year to women of all ages divided by the female population ages 15 through 44. The quotient is multiplied by 1,000. The GFR is expressed as the number of 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) in a 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, formally at UTSPH, San Antonio Campus, now at Wright State University, Dayton, OH.