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Rates and Formulae

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Rates & Formulae

Rates and ratios are calculated for a specific time period, typically a calendar year or a multiple of calendar years. Unless otherwise specified, all rates provided in this report are for Texas residents and are for the time period January 1, 2010 through December 31, 2010.

 

  • 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 population 15 - 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
  • 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): Number of births per 1,000 females ages 15 through 44:

     

    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 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 < 28 days / Number of live births * 1,000
  • Perinatal mortality ratio: Sum of fetal deaths plus neonatal deaths per 1,000 live births:

     

    (Fetal deaths + neonatal deaths) / Number of live births * 1,000
  • Perinatal mortality rate: Sum of 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 28-365 days / Number of live births * 1,000
  • Pregnancy rate: Number of pregnancies (live births, fetal deaths, and induced abortions) per 1,000 females ages 15 through 44:

     

    (live births + fetal deaths + induced terminations of pregnancy) / Female population 15-44 * 1,000

Total pregnancies are underreported because fetal deaths of less than 20 weeks gestation are not required to be reported.

 

  • Rate of natural increase: The difference between the crude birth rate and the crude death rate:

     

    Crude Birth Rate - Crude Death Rate

2010 Annual Report List of Tables and References

Annual Reports for Other Years

Center for Health Statistics

Last updated June 28, 2012