Friday, July 18, 2008

America's Birth Rates

CNN titled their article "Teen pregnancies up for first time in 15 years", based on data from this year's "America's Children in Brief: Key National Indicators of Well-Being, 2008" from the Federal Interagency Forum on Child and Family Statistics. CNN says that teen pregnancy went up for the first time in 15 years. But that's not explicitely what the data is saying! The data says live BIRTHS to teens increased. Was there an increase in pregnancy, or simply an increase in choosing birth over abortion? Or were there fewer miscarriages? Or was there an increase in multiple births? The data does not talk about any of these factors, so concluding that pregnancy is up is not proveable based on this data. The only thing the data proves is that births were up. It is quite possible that the total number of pregnancies was stable; the data does not say one way or the other.

There were 51 births (not just pregnancies, so these statistics do not include abortions and miscarriages) for every 1,000 unmarried women ages 15–44 in 2006, up from 48 per 1,000 in 2005 (figure 2) [1]. This increase in birth count has many influences: multiple births have increased due to infertility treatments, abortion rates may be lower, as demographics change we may see more births due to varied cultural values, etc. Since abortion rates are not a mandatory reporting category, we have no way to officially and formally compare births to abortions. Some agencies give estimated comparisons based on the limited data that is available. Note that this statistic does not count births to women under the age of 15. I don't know whether this information isn't collected or isn't tabulated, but procedures need to change to account for all births instead of assuming a particular 'childbearing age' range.

In 2006, the adolescent birth rate (to unmarried teens AND married teens combined) [3] was 22 births per 1,000 young women ages 15–17 (138,920 births), up from 21 births per 1,000 in 2005 (Figure 3). This was the first increase in this measure since the increase between 1990 and 1991 [4, 5, 6]. Again, the data is not proving an increase in total numbers of pregnancy, simply an increase in the number of women giving birth.

Between 1991 and 2005, the birth rate for Black, non-Hispanic teenagers ages 15–17 dropped from 86 to 35 per 1,000. The birth rate for this group increased in 2006. Are Black teens choosing birth over abortion slightly more than they did in the past?

Between 1991 and 2004, the birth rate for White, non-Hispanic teenagers dropped from 24 to 12 per 1,000 [4, 6]. The birth rate for this group increased in 2006. Are White teens choosing birth over abortion slithly more than they did in the past?


The birth rate for unmarried women has risen rapidly since 2002. [2]
  • The rate had been relatively stable between the mid–1990s and 2002, following a long-term increase between 1960 and 1994.
  • In 2006, 38 percent of all births were to unmarried women, up from 37 percent in 2005.

Between 1980 and 2006, the percentage of births to unmarried women rose sharply for women in all age groups:

  • Among teenagers, the percentage rose from 62 to 92 percent for ages 15–17 and from 40 to 81 percent for ages 18–19. So apparently teens in the 1980s were much more likely to get married when pregnant than they are currently.
  • The percentage tripled for births to women in their twenties, from 19 to 58 percent for women ages 20–24 and from 9 to 31 percent for women ages 25–29. Again, apparently 20-somethings were much more likely to get married when pregnant than they are currently.
  • The percentage of births to unmarried women in their thirties more than doubled from 8 to 18 percent. Again, apparently 30-somethings were much more likely to get married when pregnant than they are currently.
If you are the parent of a daughter who is pregnant and single (at any age group), you are certainly not alone!

[1] Hamilton, B.E., Martin, J.A., and Ventura, S.J. (2007). Births: Preliminary data for 2006. National Vital Statistics Reports, 56(7). Hyattsville, MD: National Center for Health Statistics.
[2] National Center for Health Statistics. National Vital Statistics System. (2007). Unpublished tabulations.
[3] The birth rate for adolescents ages 15–17 includes married and unmarried teenagers.
[4] Martin, J.A., Hamilton, B.E., Sutton, P.D., Ventura, S.J., Menacker, F.J., Kirmeyer, S., and Munson, M.L. (2007). Births: Final data for 2005. National Vital Statistics Reports, 56(6). Hyattsville, MD: National Center for Health Statistics.
[5] Hamilton, B.E., Martin, J.A., and Ventura, S.J. (2007). Births: Preliminary data for 2006. National Vital Statistics Reports, 56(7). Hyattsville, MD: National Center for Health Statistics.
[6] Hamilton, B.E., Sutton, P.D., and Ventura, S.J. (2003). Revised birth and fertility rates for the 1990s: United States, and new rates for Hispanic populations, 2000 and 2001. National Vital Statistics Reports, 51(12). Hyattsville, MD: National Center for Health Statistics.

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