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DHS: Oregon Teen Pregnancy Oregon Teen Pregnancy by Race; Hispanic Ethnicity; and Age Group; 1990-1996

Teen Pregnancy Oregon Teen Pregnancy by Race, Hispanic Ethnicity, and Age Group, 1990-1996

Oregon Teen Pregnancy by Race,
Hispanic Ethnicity, and Age Group, 1990-1996

Summary | Introduction | Frequently Asked Questions

( top)  SUMMARY:

These tables and graphs show the number and rate of pregnancies to Oregon resident teens by race and Hispanic ethnicity. Numbers and rates are shown for teens 10-14, 15-17, 10-17, and 18-19.


( top)  INTRODUCTION:

The US Census Bureau has recently begun providing population estimates by race and Hispanic ethnicity, making it possible for the first time to calculate rates of teen pregnancy by race and Hispanic ethnicity during non-Census years. [For Census Bureau methodology in calculating race estimates see http://landview.census.gov/population/www/documentation/twps0038.html.]

Race and ethnic groupings are based on self-reported race and Hispanic ethnicity from the U.S. Census data and self-reported race and Hispanic ethnicity from birth certificates and abortion reports. The groups are African American (Hispanic and non-Hispanic), American Indian (Hispanic and non-Hispanic), Asian & Pacific Islander (Hispanic and non-Hispanic), Hispanic (All Races), and White (non-Hispanic).

African American (Hispanic and non-Hispanic) [ table] [ graph]

American Indian (Hispanic and non-Hispanic) [ table] [ graph]

Asian and Pacific Islander (Hispanic and non-Hispanic) [ table] [ graph]

Hispanic (All Races) [ table] [ graph]

White (non-Hispanic) [ table] [ graph]

Comparison Among Groups for 10- 17-Year-Olds [ table] [ graph]


( top)  FREQUENTLY ASKED QUESTIONS:

SOURCE FOR NUMBER OF PREGNANCIES.
The pregnancy numbers include all reported births and induced terminations to Oregon resident teens. Because some neighboring states do not exchange abortion reports with Oregon, residents who obtain an out-of-state abortion may not be included in this count. Race and ethnic groupings are based on race and Hispanic ethnicity from the U.S. Census data and self-identified race and Hispanic ethnicity from birth certificates and abortion reports.

SOURCE FOR POPULATION ESTIMATES.
Population denominators for calculating rates were calculated by applying the ratios from the U.S. Census Bureau's race estimates to the total 5-year-age-group estimates calculated by Portland State University's Center for Population Research and Census. The ratio method was used to adjust the Census Bureau data to sum to the Population Center's totals.

METHODOLOGY FOR POPULATION ESTIMATES.
Actual population numbers are only available during Census years. Between Census years the Center for Health Statistics uses population estimates from Portland State University's Center for Population Research. The PSU Population Center provides yearly county-level estimates by age-group and gender. [For PSU Population Center data, see www.upa.pdx.edu/CPRC/pbsrv1.html]. The PSU Population Center provides data in five-year age groups (10-14, 15-19, etc.). Population Center estimates for 15- to 17-year-olds were calculated by multiplying the estimate for 15- to 19-year-olds by 3/5-ths, and estimates for 18- to 19-year-olds were calculated by multiplying the estimate for 15- to 19-year-olds by 2/5-ths..
METHODOLOGY FOR RACE ESTIMATES.
In order to match the estimate of the total number of Oregon teens to the PSU Population Center's estimated total (and the total teen pregnancy rate calculated from that denominator), proportions for each age and race/ethnicity group from the Census estimate were applied to the PSU Population Center's totals for each age group. For example:
The population denominator for African American females age 10-14 in 1996, was calculated by 1) dividing the Census Bureau's estimate of African American females 10-14 in 1996 (2,573) by 2) the Census Bureau's estimate of total females 10-14 in 1996 (112,828), and 3) multiplying that proportion by the PSU Population Center's estimate for total 10- to 14-year-old females in 1996 (108,558). By this method, the adjusted number for African-American 10- to 14-year-old females. is 2,476. [((2,573 / 112,828) * 108,558) = 2,475.6].


CHI-SQUARE TREND ANALYSIS.
Chi-square trend analysis was done to determine if the teen pregnancy rates over time (1990-1996) in each group show a significant upward or downward trend from the 1990 baseline pregnancy rate for each age group. A trend is considered significant if the p value is less than .05, in which case there is a 95% probability that a trend exists in the population. The chi square trend examines the odds ratio relative to a baseline measure. In this analysis, the baseline is the 1990 teen pregnancy rate for each group.

Portland State University Population Estimates
www.upa.pdx.edu/CPRC/pbsrv1.html

US Census Bureau Population Estimates
http://eire.census.gov/popest/archives/county/co_casrh.php