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Calculating Teen Pregnancy Rates

The Center for Health Statistics has recently developed a system to calculate preliminary teen pregnancy rates for the Oregon Benchmark age category of 10-17 year olds at the state and county level. 

 

Everything you need to know to get started:

Preliminary 12-Month Moving Total:

The 12-month moving total is the sum of monthly counts of teen pregnancies for 10-17 year old Oregon resident females (births + abortions* during the previous 12-month period.)**
Example:
2010                    2010                    2011
J F M A M J J A S O N D J F M A M J J A S O N D J
  |    Feb10 - Jan11    |
    |    Mar10 - Feb11    |
      |    Apr10 - Mar11    |
                    ...
                          |    Feb11 - Jan12    |

 

Preliminary Rolling Rate:

The pregnancy rate per 1,000 females 10-17 is calculated by dividing the 12-month moving total pregnancies by the most recent population estimate for Oregon females 10-17 years old, multiplied by 1,000. During the year, the data are under constant revision.

 

Population Estimates:

The most current population estimates will be used, and replaced when new estimates are available. Population data by gender and age are typically available in February following the estimate year. Because of this, up to ten months of the current year's rates will be calculated using the previous year's population estimates. Teen pregnancy rates will be affected in counties with rapidly changing population estimates for teen females. Population estimates are provided by the Center for Population Research and Census, Portland State University.

 

YTD Pregnancies:

Year-to-date (YTD) pregnancies are the sum of Oregon resident births and abortions to 10-17 year old females as they are reported and updated monthly to the Center for Health Statistics. The YTD figure is the actual number of pregnancies reported for the specific calendar year.

 

Provisional and Final Rates:

Provisional rates are undergoing final editing procedures, and may result in occasional and minor changes. Please label data as provisional when reporting. Final Rates for past years will not change and have been published in various vital statistics publications.


PLEASE CALL (971) 673-1156 FOR FURTHER INFORMATION OR QUESTIONS.


*For all tables associated with this project, abortion is defined as an induced termination of pregnancy, and does not include spontaneous abortions (miscarriages).

**Rates and counts in counties where women typically travel to other states to obtain medical services will reduce counts and rates until data are received from other states. This typically occurs a few months before the end of a calendar year. The reporting of abortions to the Center for Health Statistics is often delayed, which will also reduce counts and rates until the data are received.