Tag Archives: teen births

Fertility trends explained, 2017 edition

Not really, but some thoughts and a bunch of figures on the 2017 fertility situation.

There was a big drop in the U.S. fertility rate in 2017. As measured by the total fertility rate (TFR), which is a projection of lifetime births for the average woman based on one year’s data, the drop was 3.1%, from 1.82 projected births per woman to 1.76. (See this measure explained, and learn how to calculate it yourself, in my blockbuster video, “Total Fertility Rate.”) To put that change in perspective, here is the trend in TFR back to 1940, followed by a plot of the annual changes since 1971:



That drop in 2017 is the biggest since the last recession started. In fact, we have seen no drop that big that’s not associated with a time of national economic distress, at least since the Baby Boom. In 2010, I noted that the drop in fertility at that time preceded the official start of the recession and the big unemployment spike. There is now some more systematic evidence (pointed out by Karen Benjamin Guzzo) that fertility falls before economic indicators turn down. Which makes this New York Times headline a little funny, “US Births Hit a 30-Year Low, Despite Good Economy.” This is a pretty solid warning sign, although not definitive, of an economic downturn coming in the next year or so. (On the other hand, maybe it’s a Trump effect, as people are just freaking out and not thinking positively about the future; something to think about.)

Whatever the role of immediate economic conditions, the long-term trend is toward later births, which is generally going to mean fewer births — both because people who want later births tend to want fewer births, and because some people run out of time if they start late. And that is not wholly separable from economic factors, of course. People (especially women) delay childbearing to improve their economic situation, as they improve their economic situation when they delay births (if they have the right suite of economic opportunities). To show this trend, I’ve been updating this figure for a few years (you’ll find it, and a description, in my book Enduring Bonds).

change in birthrates by age 1989-2016.xlsx

The real reason I made this figure was to highlight the interconnected nature of teen births. Birth rates for teens have fallen dramatically, but it’s been along with drops among younger women generally, and increases among older women — it’s about delaying births overall. Note, however, that 2017 is the first time since the depths of the last recession that birth rates fell for all age groups except women over age 40.

So, sell stock now. But it is hard to know for sure what’s a local temporal reaction and what’s just the way things are going nowadays. For that it’s useful to compare the U.S. to other countries. The next figure shows the U.S. and 15 other hand-picked countries, from World Bank data. Rising fertility in the decade before the last recession wasn’t so unusual. We are a little like Spain and France in this figure, who had rising fertility then and falling now. But Germany and Japan are still rising, at least through 2016. All this is at below-replacement levels (about 2.0), meaning eventually these rates lead to population decline, in the absence of immigration. The figure really shows the amazing fertility transformation of the last half century, especially in giant countries like China, India, and Brazil. Who would have thought we’d live to see Brazil have lower fertility rates than the U.S.? It’s been that way for more than a decade (click to enlarge).

country fertilitiy trends.xlsx

Anyway, it’s my position that our below-replacement fertility levels are themselves nothing to worry about at present. There are still lots of people who want to move here (or, there were before Trump). And we can live with low fertility for a long time before the population starts to decline in a meaningful way. Eventually it will be a good idea to stop perpetual population growth anyway, so we may as well start working on it. This is better than trying to shape domestic policy to increase birth rates.

That said, there is an argument that Americans are having fewer children than they want to because of our stone age work-family policies, especially poor family leave support and the high costs of good childcare. I’m sure that’s happening to some degree, but it’s still the case that more privileged people, who should be able to overcome those things more readily — people with college degrees and Whites — have lower fertility rates than people who are getting squeezed more. People who assume their kids are going to college are naturally concerned with rising higher education costs, both their own loan payments and their kids’ future payments. So it’s a mixed bag story. Here are the predictors of childbearing for women ages 15-44 in the 2016 American Community Survey. These are the probabilities of having had a birth in the previous 12 months, estimated (with logistic regression) at the mean of all the variables shown.*

birth model simple 2016.xlsx

Interesting that there’s only a small foreign-born fertility edge in this multivariate model. In the unadjusted data, 7.4% of foreign-born versus 6.0% of U.S.-born women had a baby, but that’s mostly accounted for by their age, education, and race/ethnicity.

To summarize: 2017 was a big year for fertility decline (at all but the highest ages), the economy is probably about to tank, and the U.S. fertility rate is still relatively high for our income level, especially for racial-ethnic minorities.

Happy to have your thoughts in the comments. For more, check the fertility tag.

* Here’s the Stata code for the regression analysis. It’s just some simple recodes of the ACS data from IPUMS.org. Start with a file of women ages 15-44, with the variables you see here, and then do this to it:

recode educd (0/61=1) (62/64=2) (65/90=3) (101/116=4), gen(edcat)
label define edlbl 1 "Less than high school"
label define edlbl 2 "High school graduate", add
label define edlbl 3 "Some college", add
label define edlbl 4 "BA or higher", add
label values edcat edlbl
gen raceth=race
replace raceth=4 if race==5 | race==6 /* now 4 is all API */
replace raceth=5 if hispan>0
drop if race>5
label define raceth_lbl 1 "White"
label define raceth_lbl 2 "Black", add
label define raceth_lbl 3 "AIAN", add
label define raceth_lbl 4 "API", add
label define raceth_lbl 5 "Hispanic", add
label values raceth raceth_lbl
egen agecat=cut(age), at(15(5)50)
gen forborn=citizen!=0
gen birth=fertyr==2
logit birth i.agecat i.raceth i.forborn i.edcat i.marst [weight=perwt]
margins i.agecat i.raceth i.forborn i.edcat i.marst


Filed under In the news

’16 and Pregnant’ and less so


From Flickr/CC: https://flic.kr/p/6dcJgA

Regular readers know I have objections to the framing of teen pregnancy, as a thing generally and as a problem specifically, separate from the rising age at childbearing generally (see also, or follow the teen births tag).

In this debate, one economic analysis of the effect of the popular MTV show 16 and Pregnant has played an outsized role. Melissa Kearney and Phillip Levine showed that was more decline in teen births in places where the show was popular, and attempted to establish that the relationship was causal — that the show makes people under age 20 want to have babies less. As Kearney put it in a video promoting the study: “the portrayal of teen pregnancy, and teen childbearing, is something they took as a cautionary tale.” (The paper also showed spikes in Twitter and Google activity related to birth control after the show aired.)

This was very big news for the marriage promotion people, because it was taken as evidence that cultural intervention “works” to affect family behavior — which really matters because so far they’ve spent $1 billion+ in welfare money on promoting marriage, with no effect (none), and they want more money.

The 16 and Pregnant paper has been cited to support statements such as:

  • Brad Wilcox: “Campaigns against smoking and teenage and unintended pregnancy have demonstrated that sustained efforts to change behavior can work.”
  • Washington Post: “By working with Hollywood to develop smart story lines on popular shows such as MTV’s ’16 and Pregnant’ and using innovative videos and social media to change norms, the [National Campaign to Prevent Teen and Unplanned Pregnancy] has helped teen pregnancy rates drop by nearly 60 percent since 1991.”
  • Boston Globe: “As evidence of his optimism, [Brad] Wilcox points to teen pregnancy, which has dropped by more than 50 percent since the early 1990s. ‘Most people assumed you couldn’t do much around something related to sex and pregnancy and parenthood,’ he said. ‘Then a consensus emerged across right and left, and that consensus was supported by public policy and social norms. . . . We were able to move the dial.’ A 2014 paper found that the popular MTV reality show ’16 and Pregnant’ alone was responsible for a 5.7 percent decline in teen pregnancy in the 18 months after its debut.”

I think a higher age at first birth is better for women overall, health permitting, but I don’t support that as a policy goal in the U.S. now, although I expect it would be an outcome of things I do support, like better health, education, and job opportunities for people of color and people who are poor.

Anyway, this is all just preamble to a new debate from a reanalysis and critique of the 16 and Pregnant paper. I haven’t worked through it enough to reach my own conclusions, and I’d like to hear from others who have. So I’m just sharing the links in sequence.

The initial paper, posted as a (non-peer reviewed) NBER Working Paper in 2014:

Media Influences on Social Outcomes: The Impact of MTV’s 16 and Pregnant on Teen Childbearing, by Melissa S. Kearney, Phillip B. Levine

This paper explores how specific media images affect adolescent attitudes and outcomes. The specific context examined is the widely viewed MTV franchise, 16 and Pregnant, a series of reality TV shows including the Teen Mom sequels, which follow the lives of pregnant teenagers during the end of their pregnancy and early days of motherhood. We investigate whether the show influenced teens’ interest in contraceptive use or abortion, and whether it ultimately altered teen childbearing outcomes. We use data from Google Trends and Twitter to document changes in searches and tweets resulting from the show, Nielsen ratings data to capture geographic variation in viewership, and Vital Statistics birth data to measure changes in teen birth rates. We find that 16 and Pregnant led to more searches and tweets regarding birth control and abortion, and ultimately led to a 5.7 percent reduction in teen births in the 18 months following its introduction. This accounts for around one-third of the overall decline in teen births in the United States during that period.

A revised version, with the same title but slightly different results, was then published in the top-ranked American Economic Review, which is peer-reviewed:

This paper explores the impact of the introduction of the widely viewed MTV reality show 16 and Pregnant on teen childbearing. Our main analysis relates geographic variation in changes in teen childbearing rates to viewership of the show. We implement an instrumental variables (IV) strategy using local area MTV ratings data from a pre-period to predict local area 16 and Pregnant ratings. The results imply that this show led to a 4.3 percent reduction in teen births. An examination of Google Trends and Twitter data suggest that the show led to increased interest in contraceptive use and abortion.

Then last month David A. Jaeger, Theodore J. Joyce, and Robert Kaestner posted a critique on the Institute for the Study of Labor working paper series, which is not peer-reviewed:

Does Reality TV Induce Real Effects? On the Questionable Association Between 16 and Pregnant and Teenage Childbearing

We reassess recent and widely reported evidence that the MTV program 16 and Pregnant played a major role in reducing teen birth rates in the U.S. since it began broadcasting in 2009 (Kearney and Levine, American Economic Review 2015). We find Kearney and Levine’s identification strategy to be problematic. Through a series of placebo and other tests, we show that the exclusion restriction of their instrumental variables approach is not valid and find that the assumption of common trends in birth rates between low and high MTV-watching areas is not met. We also reassess Kearney and Levine’s evidence from social media and show that it is fragile and highly sensitive to the choice of included periods and to the use of weights. We conclude that Kearney and Levine’s results are uninformative about the effect of 16 and Pregnant on teen birth rates.

And now Kearney and Levine have posted their response on the same site:

Does Reality TV Induce Real Effects? A Response to Jaeger, Joyce, and Kaestner (2016)

This paper presents a response to Jaeger, Joyce, and Kaestner’s (JJK) recent critique (IZA Discussion Paper No. 10317) of our 2015 paper “Media Influences on Social Outcomes: The Impact of MTV’s 16 and Pregnant on Teen Childbearing.” In terms of replication, those authors are able to confirm every result in our paper. In terms of reassessment, the substance of their critique rests on the claim that the parallel trends assumption, necessary to attribute causation to our findings, is not satisfied. We present three main responses: (1) there is no evidence of a parallel trends assumption violation during our sample window of 2005 through 2010; (2) the finding of a false placebo test result during one particular earlier window of time does not invalidate the finding of a discrete break in trend at the time of the show’s introduction; (3) the results of our analysis are robust to virtually all alternative econometric specifications and sample windows that JJK consider. We conclude that this critique does not pose a serious threat to the interpretation of our 2015 findings. We maintain the position that our earlier paper is informative about the causal effect of 16 and Pregnant on teen birth rates.


There are interesting methodological questions here. It’s hard to identify the effects of interventions that are swimming with the tide of change. In fact, the creation of the show, the show’s popularity, the campaign to end teen pregnancy, and the rising age at first birth may all be outcomes of the same general historical trend. So I’m not that invested in the answer to this question, though I am very interested.

There are also questions about the publication process, which I am very invested in. That’s why I work to promote a working paper culture among sociologists (through the SocArXiv project). The original paper was posted on a working paper site without peer review, but NBER is for economists who already are somebody, so that’s a kind of indirect screening. Then it was accepted in a top peer-reviewed journal (somewhat revised), but that was after it had received major attention and accolades, including a New York Times feature before the working paper was even released and a column devoted to it by Nicholas Kristof.

So is this a success story of working paper culture gone right — driving attention to good work faster, and then also drawing the benefits of peer review through the traditional publication process? (And now continuing with open debate on non-gated sites). Or is it a case of political hype driving attention inside and outside of the academy — the kind of thing that scares researchers and makes them want to retreat behind the slower, more process-laden research flow which they hope will protect them from exposure to embarrassment and protect the public from manipulation by the credulous news media. I think the process was okay even if we do conclude the paper wasn’t all it was made out to be. There were other reputational systems at work — faculty status, NBER membership, New York Times editors and sources — that may be as reliable as traditional peer review, which itself produces plenty of errors.

So, it’s an interesting situation — research methods, research implications, and research process.


Filed under Research reports

Teen birth rate low but Bible remains a concern

In 2012 I did a post about teen birth rates, abstinence, and Google searches for Antichrist stuff. The most important point was that abstinence education doesn’t work. In this post I use the percentage of teen (women) having a birth, and see what people are Googling in places with more teen births.

This is an inductive approach that generates ideas and surprises. Out of the billions of things people search for, which searches are most correlated with a demographic or social pattern across states? For example, the relationship between low marriage rates and searches about Kanye West is very strong (even controlling for a bunch of demographics), and state suicide rates are highly correlated with lots of searches about guns. If you think these are random flukes, you may be right — but then look at what searches correlate with racial/ethnic composition of states.

So for teen births, this is easy to get from the American Community Survey via IPUMS (I used the 2010-2014 combined file), which asks of each person if they had a baby in the previous year. Teen birth rate is the percentage of women ages 15-19 who did. Then you surf over to the Google Correlate tool and upload the teen birth rates file. The result is the 100 searches that are most highly correlated with the state file you uploaded. Someone with the keys to Google could get more, but this is what any member of the public can do.

We know that teen births are most common in the Southwest and South, and that broad pattern is really what’s most important: Republican-dominated states, the Bible belt, and places with a lot of poor young people.* Here’s the broad strokes:


The Google searches is just for thinking about subtler cultural relationships and generating ideas.

Among the top 100 searches most correlated with teen births, American muscle cars stand out: Mustangs (13), Camaros (5), Hummers, Chargers, along with related things like transmissions. Next, however, is Bible stuff. There are 12 searches that correlate with the teen birth rate at .80 or higher on the list:

original bible
book of enoch
bible talk
the book of enoch
i believe in god
book of enoch pdf
bible names
the truth shall set you free
truth shall set you free

Here’s a map showing the ACS teen births rates on the left and searches for “original bible” on the right, correlation .83:


(A little disturbingly, “what is cinnamon” is also high on the list [correlation .81] — cinnamon is often promoted as a “natural” medicine to cause miscarriage.)

I exported the correlation file from Google and then averaged those 12 searches, producing a bible searches index that correlates with teen births at .87 (all the search correlations come out as z-scores, so the average has mean of 0 and s.d. of .93). Here are the results:**


I’m no Bible expert, and this could all be a total coincidence, but I think some real research on it might be pretty interesting. Maybe the people who say the Bible is awesome for families and teen births are bad should look into it.***

Followup: Of course, if you only look at the highest correlations out of billions, you find high correlations. So I don’t expect a research award for discovering that. And that fact that these bible searches are from certain niches of Christianity is an interesting tidbit but just as food for thought. The more theory-driven version of this research might start with searches for just the word “bible”and test the hypothesis that it’s correlated with teen births.  That relationship is not as strong (correlation .74), but it’s still plenty to go on:


I take from this weaker finding that the stronger pattern above is not just a fluke or an artifact of the method.

  • Follow the Google tag to see the many posts using this stuff.
  • Follow the teen birth tag for more, including the argument that the teen birth rate is a myth, and the racial implications of promoting delayed births.


* This survey measure is correlated .89 with the 2008 list of state teen birth rates published by the National Center for Health Statistics. I would have a better sense of which is the right one to use if Google Correlate would say what time period is used for their analysis, but I can’t find that anywhere. When I used the NCHS list instead of my ACS list, it was more dominated by muscle cars and had less Bible stuff, as only “book of enoch” was in the top 100, correlated .87 with teen births.

** Here's the Stata command for making this figure (which I then prettied up a little):
gr twoway (scatter teenbirth biblesearch , mlabel(state) mlabposition(0) msymbol(i)) (lfit teenbirth biblesearch)

*** The 2010-2014 teen birth rates, from the IPUMS release of ACS data are these:

State State Teen birth rate (%)
Alabama AL 2.44
Alaska AK 2.727
Arizona AZ 2.385
Arkansas AR 2.886
California CA 1.901
Colorado CO 1.755
Connecticut CT 0.902
Delaware DE 1.644
District of Columbia DC 2.088
Florida FL 2
Georgia GA 2.578
Hawaii HI 1.991
Idaho ID 2.202
Illinois IL 2.009
Indiana IN 2.69
Iowa IA 1.477
Kansas KS 2.432
Kentucky KY 2.936
Louisiana LA 2.36
Maine ME 0.852
Maryland MD 1.783
Massachusetts MA 0.941
Michigan MI 1.881
Minnesota MN 1.428
Mississippi MS 3.545
Missouri MO 2.756
Montana MT 2.065
Nebraska NE 1.304
Nevada NV 2.449
New Hampshire NH 1.135
New Jersey NJ 1.005
New Mexico NM 3.5
New York NY 1.494
North Carolina NC 2.48
North Dakota ND 2.328
Ohio OH 1.901
Oklahoma OK 3.214
Oregon OR 1.568
Pennsylvania PA 1.928
Rhode Island RI 1.978
South Carolina SC 2.829
South Dakota SD 2.271
Tennessee TN 2.974
Texas TX 3.303
Utah UT 1.666
Vermont VT 1.073
Virginia VA 1.636
Washington WA 1.688
West Virginia WV 2.146
Wisconsin WI 1.305
Wyoming WY 1.6


Filed under In the news

The fathers behind teen births (or, statistical memes and motivated blind trust)

When makes people trust statistical memes? I don’t know of any research on this, but it looks like the recipe includes a combination of scientific-sounding specificity, good graphics, a source that looks credible, and – of course – a number that supports what people already believe (and want their Facebook friends to believe, too).

If that’s the problem, and assuming the market can’t figure out how to make journalism work, I have no solution except seizing the Internet and putting it under control of the Minister of Sociology, or, barring that, encouraging social scientists to get engaged, help reporters, and make all their good work available publicly, free, and fast.

Today’s cringe:


The blogger TeenMomNYC takes credit for creating this, and the Facebook version has been shared tens of thousands of times. Its popularity led to this story from Attn: “The Truth About Teenage ‘Baby Mamas’ is Quite Revealing.” (If anyone did want to study this issue, this is a neat case study, because she posted 8 “did you know” graphics on Facebook at the same time, and none of the others took off at all – why?)

I don’t know anything about TeenMomNYC, but I share her desire to stop stigmatizing and shaming young mothers. I wish her work were not necessary, but I applaud the effort. That said, I don’t necessarily think shaming young fathers (even if they’re not quite as young) is a solution to that, but that’s not the point. My point is, what is this statistic?

According to the footnote (thanks!), it comes from this 1995 National Academies report, and (except for changing “29” to “29.7”) it represents it accurately. From p. 205:

These data highlight an additional component of the sexual abuse picture— the evidence that an appreciable portion of the sexual relationships and resulting pregnancies of young adolescent girls are with older males, not peers. For example, using 1988 data from the NSFG and The Alan Guttmacher Institute, Glei (1994) has estimated that among girls who were mothers by the age of 15, 39 percent of the fathers were ages 20–29; for girls who had given birth to a child by age 17, the comparable figure was 53 percent. Although there are no data to measure what portion of such relationships include sexual coercion or violence, the significant age difference suggests an unequal power balance between the parties, which in turn could set the stage for less than voluntary sexual activity. As was recently said at a public meeting on teen pregnancy, “can you really call an unsupervised outing between a 13-year-old girl and a 24-year-old man a ‘date’?”

This is an important point, and was good information in 1995, when it cited a 1994 analysis of 1988 data, which asked women ages 15-44 a retrospective question. In other words, this refers to births that took place as early as 1958, or between 28 and 58 years ago. That is historical, and really shouldn’t be used like this today, given how much has changed regarding teen births.

The analysis is of the 1988 National Survey of Family Growth, a survey that was repeated as recently as 2011-2013. Someone who knows how to use NSFG should figure out the current state of the age gap between young mothers and fathers and let TeenMomNYC know.

Even if I didn’t know the true, current statistic, this would give me pause. Births to women before age 15 are extremely rare. The American Community Survey, which asks millions of women whether they have had a birth in the previous year, does not even ask the question of women younger than 15. The ACS reports there were 179,000 births in the previous year among women who were under 20 when interviewed, of which only 6,500 were to women age 15 at the interview. So that’s 3.7% of teen births, and 3 out of every thousand 15-year-old women. In 1958 this was much more common, and the social environment was much different.

Another issue is the age range of the fathers, 20-29, which is very wide when dealing with such young mothers. Look at the next phrase from the 1995 report: “girls who had given birth to a child by age 17, the comparable figure was 53 percent.” Realize that the great majority of girls who had a birth “by age 17” were 17 when they did, and the great majority of those men were probably close to 20. I’m not very positive about 20-year-old men having children with 17-year-old women, but it’s pretty different from 29-versus-13.

I can’t find the original source for this, but this report from the Resource Center for Adolescent Pregnancy Protection attributes this table to the California Center for Health Statistics in 2002, which shows that the father was age 20 or older  for 23% of women who had a birth before age 15. And of those, 93% were 20-24 (rather than 25+).


Anyway, this is a good case of a well-intentioned but under-resourced effort to sway people with true information, picked up by click-bait media and repeated because people think it will help them win arguments, not because they have any real reason to believe it’s true (or not true).

So I really hope someone with the resources, skills, and training to answer this question will produce the real numbers regarding father’s age for teen births, and post them, with accompanying non-technical language, along with their code, on the Open Science Framework (or other open-access repository).

Fixing the media and its economy is a tall order, but academics can do better if we put our energy into this work, reward it, and restructure our own system so that good information gets out better, faster and more reliably.

Related posts:


Filed under In the news

Delayed parenting and anti-poverty policy

Here’s a preview of talk today at Brown University’s population center.

My basic argument is that policies intended to prevent poverty by delaying parenthood are mostly misplaced, especially with regard to Black women. Not that delaying parenthood is bad per se, but delaying parenthood in the absence of other improvements in people’s conditions is ineffectual in the aggregate, and actually harmful for some populations.

The delayed childbearing argument features prominently in the recent “consensus” on anti-poverty strategy reached by the American Enterprise Institute / Brookings working group I wrote about here. They say:

It would be better for couples, for children, and for society if prospective parents plan their births and have children only when they are financially stable, are in a committed relationship (preferably marriage), and can provide a stable environment for their child.

Isabel Sawhill, a leading proponent of delayed childbearing as anti-poverty strategy, says in her book Generation Unbound, that she is not telling poor people not to have children, but she sort of is. She writes:

It is only fair to expect parents to limit the number of children they have to something they can afford.

The evidence I offer to help argue that this approach is unhelpful includes this paper (the actual new research for the talk), which shows the risk of infant mortality rising with parent age for Black mothers, a pattern strikingly different from White and Hispanic mothers’ (see a discussion here). Here’s that result:


Adjusted Probability of Infant Death, by Maternal Age: White, Black, and Mexican Mothers, U.S., 2013. Predicted probabilities of infant death generated by Stata margins command, adjusted for plurality, birth order, maternal education, prenatal care, payment source, and cigarette smoking during pregnancy. Data source: 2013 Period Linked Birth/Infant Death Public Use File, Centers for Disease Control.

Of course, infant mortality is thankfully very rare, but it’s the extreme measure for the underlying pattern of women’s health. When infant mortality in a group is higher, their average health is usually worse.

I’m adding to that the following descriptive figures on children’s poverty rates according to how old their mothers were when they were born. This is by necessity limited to children who are still living with their mothers, because I used the Current Population Survey. I show this for all children (black lines), and then for those whose mothers have never married (red lines). The solid lines are official poverty-line rates, and the dotted lines use the Supplemental Poverty Measure. The latter shows lower poverty rates for children whose mothers were younger, because it reflects transfer income and welfare support as well as income from unmarried cohabiting partners.


For children overall (black lines), being born to an older mother appears beneficial in terms of poverty rates. This fits the standard story, in which delaying births allows women to go further in school and their careers, and get married, as well as being more mature and so on. However, for those whose mothers remain unmarried the relationship is much weaker, and there is no relationship to the SPM. To me this undermines the policy of delay with regard to women who have low probability of marriage during their child-bearing years. Which brings me back to Black women.

I estimated the same pattern by race/ethnicity, this time just using the SPM, in a model that controls for child age, sex, nativity, geography, and mother’s marital status (ever- versus never-married). I didn’t control for education, because schooling is also an outcome of birth timing (so if young mothers don’t go to college for that reason, this would show them more likely to be poor as a result). Here’s the result:


For White women there is a strong relationship, with lowest poverty rates for children whose mothers were in their 30s when they were born. For Black and Hispanic women the relationship is much weaker (it actually looks very similar when you control for education as well, and if you use the continuous income-to-needs ration instead of the poverty-line cutoff).

My conclusion is that I’m all for policies that make family planning available, and U.S. women should have better access to IUDs in particular (which are much more common in other rich countries) — these need to be part of better medical care for poor people in general. But I don’t favor this as a poverty-reduction strategy, and I reject the “responsibility” frame for anti-poverty policy evident in the quotes above. I prefer education, jobs, and income support (which Sawhill also supports, to her credit). See Matt Bruenig on the Brookings “Success Sequence” and my op-ed on income support.

Ideals and intentions

Consider this from Sawhill. In her book Generation Unbound, she writes:

‘poor and minority women … themselves do not want to have as many children as they are currently having. Unintended pregnancy rates are much higher among the poor, minority groups, and the less-educated … [free, better contraception] can help poorer and less-educated women align their behavior with their intentions.’ (p. 138)

I think we need to take a little more complicated view of intentions here. She is referring to what demographers call “unintended” births, which means the woman recalls that she was not intending to get pregnant at the time — she either wanted to get pregnant some time in the future, or never. As you can see, such unintended pregnancies are very common:


However, most poor women think the ideal family size is large. Among young women, 65% of women who didn’t finish high school, and 48% of those with high school degrees but no BA, believe 3 or more children is the ideal for a family:


For lots of their births, poor women were not ready, or not planning to get pregnant. But it’s also common for poor people to never achieve their ideal conditions for having children — good job, marriage, housing, education, and so on. In that case, with the clock running on their (and their mothers’) health, unintended childbearing is more complicated than just a behavior problem to be solved. It may reflect a compromise between unachievable goals.

In addition to making sure everyone has the reproductive healthcare they need (including more effective contraception), I think we should also help people achieve their long-term ideals — including having the children they want to have — rather than (just) help them realize their short-term intentions.


Filed under Me @ work, Research reports

Colorado leads drop in teen birth rate, 2008-2013

Yesterday I tweeted a figure of teen birth rate changes based on the fertility question in the American Community Survey. It showed Colorado with an above-average drop in teem births from 2008 to 2013, but not the biggest drop in the country. I have a better chart on this below.

The reason for the attention was this story in the New York Times, which reported:

Over the past six years, Colorado has conducted one of the largest experiments with long-acting birth control. If teenagers and poor women were offered free intrauterine devices and implants that prevent pregnancy for years, state officials asked, would those women choose them?

They did in a big way, and the results were startling. The birthrate among teenagers across the state plunged by 40 percent from 2009 to 2013, while their rate of abortions fell by 42 percent, according to the Colorado Department of Public Health and Environment.

Since the article didn’t provide data for comparisons, and I knew teen births were declining all over, I wanted to see if Colorado’s experiment was really such a standout. The figure was republished by German Lopez at Vox.com in a post on the Colorado program. Although the figure showed Colorado with a big drop, it still cast doubt on the program because it showed four states and DC with bigger drops.

I’m retracting that figure today, because I realized — and I should have known this — that we have teen birth rates by state and year from the vital records data reported by the National Center for Health Statistics. In these reports we can see that Colorado did, in fact, have the largest decline in teen births from 2008 and 2013 (their program started in 2009). Here’s the new figure:


The story isn’t that different between NCHS and ACS data, but Colorado is trying to raise money to continue the program, and it sure is nice for them to have this comparison. It’s great to have data right away — and share it — and it’s also great, even greater, to have better data. The vital records data is more complete and reliable, since it is not based on a sample, and teen births are rare enough now that sampling variation matters, even in a big sample like the ACS. So I regret that I published the earlier figure.

That said…

The teen birth rate is declining all over the country, even in places with terrible policies, so the Colorado program — valuable as it may be — is swimming with the tide.

The reason teen births are declining all over is because the teen birth rate is a myth — what’s really happening is women in the U.S. are having their children later, for economic and social reasons that go way beyond what’s happening with teens per se. I have written about this a few times:

See also:


Filed under In the news

Marriage promotion and the myth of teen pregnancy

First some context, then some data.

Ruth Graham has a story in the Boston Globe about how liberals and conservatives — researchers as well as policy advocates — are starting to agree that marriage is good and policy should promote it. I’m quoted, but apparently as an example of what Andrew Cherlin refers to as someone standing at “a line some liberal sociologists won’t cross, that line of accepting marriage as the best arrangement.” This is part of a spate of stories in which journalists look for a new consensus on marriage. Previous entries include David Leonhardt in the New York Times saying liberals are wrong in attributing the decline of marriage to economics alone, and Brigid Schulte in the Washington Post reporting that Isabel Sawhill has given up on “trying to revive marriage.” The narrow consensus in policy terms involves a few things, like increasing the Earned Income Tax Credit and reducing marriage penalties in some parts of the safety net, along with trying to improve conditions at the low end of the labor market (see this Center for American Progress report for the liberal side of these policies).

From teen births to marriage promotion

The idea of a cultural revival of marriage has been the futile bleat of the family right for decades, most recently retooled by David Blankenhorn. And in recent years these ideologues have taken to using as an example the supposed success of the cultural intervention to reduce teen pregnancy, to show how we might increase marriage and reduce nonmarital birth rates. This has been a common refrain from Brad Wilcox, quoted here by Graham:

As evidence of his optimism, Wilcox points to teen pregnancy, which has dropped by more than 50 percent since the early 1990s. “Most people assumed you couldn’t do much around something related to sex and pregnancy and parenthood,” he said. “Then a consensus emerged across right and left, and that consensus was supported by public policy and social norms. … We were able to move the dial.”

I think that interpretation is not just wrong, it’s the opposite of right, as I’ll explain below.

I don’t know of any evidence that cultural intervention affected teen birth rates. Cultural intervention effects are different from cultural effects — of course cultural change is part of the trend in marriage and birth timing, but the commonly cited paper showing an apparent effect of 16 and Pregnant on teen births, for example, is not evidence that the campaign to reduce teen pregnancy was successful. There was a campaign to end teen pregnancy, and teen pregnancy declined. I think the trend might have happened for the same set of reasons the campaign happened — the same reasons for the decline in marriage and the shift toward later marriage. The campaign was one expression of shifting norms toward women’s independence, educational investment, and delayed family formation.

The myth of teen pregnancy

I’ve been trying to say this for a while, and it doesn’t seem to be taking. Maybe I’m wrong, but I’m not giving up yet. So here goes again.

If you had never heard of teen pregnancy, you would see the decline in births among teenagers as what it is: part of the general historic trend toward later births and later marriage. I tried to show this in a previous post. I’ll repeat that, and then give you the new data.

First, I showed that teen birth trends simply follow the overall trend toward later births. Few births at young ages, more at older ages:

It doesn’t look like anything special happening with teens. To show that a different way, I juxtaposed teen birth rates with the tendency of older women (25-34) to have births relative to younger women (20-24). This showed that teen births are less common where older births are more common:

In other words, teen births follow general trends toward older births.

Today’s data exercise

Here’s a more rigorous (deeper dive!) into the same question. I show here that teenage women are less likely to have a birth if they live in place with higher age at marriage, and if they live in a place with lower marriage rates. That is, lower teen births go along with the main historical trend: delayed and declining marriage.

So if you think declining teen births are an example of how a policy for “cultural” intervention can reverse the historical tide, you’re not just wrong, you’re the opposite of right. The campaign to reduce teen births succeeded in doing what was happening already. This is not a model for marriage promotion.

Here’s what I did. I used the 2009-2011 American Community Survey, distributed by IPUMS.org. For 283 metropolitan areas, accounting for 73% of all U.S. 15-19 year-old women, I calculated the odds of a teenage woman reporting a birth in the previous year, as a function of: (a) the median age of women who married in that area in the previous year, and (b) the proportion of women ages 18-54 that are currently married in that area. I adjusted these odds for age, race/ethnicity, and nativity (foreign born). I didn’t adjust for things that are co-determined with births among teens, such as marital status, education, and living arrangements (in other words there is plenty of room to dive deeper). All effects were statistically significant when entered simultaneously in a logistic regression model, with robust standard errors for metro area clustering.*

The figures show probabilities of having a birth in the last year, adjusted for those factors, with 95% confidence intervals:



To summarize:

  • Teen births are a myth. There are just births to people ages 13 to 19.
  • Teen births have fallen as people increasingly delay childbearing and marriage. Falling teen births are simply part of the historical trend on marriage: rising age at marriage, declining marriage rates.
  • The campaign to prevent teen births coincided with the trends already underway. Any suggestion that this could be a model for promoting marriage — that is, a policy that goes against the historical tide on marriage — is hokum.
  • There remains no evidence at all to support any policy intervention to promote marriage.

* Well, the age at marriage effect is on significant at p=.054 (two-tailed), but my hypothesis is directional — and that cluster adjustment is brutal! Anyway, happy to share code and output, just email me. Here’s the regression table:



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