NEW: The Contraceptive Access Maps are live, built in partnership with @powertodecide.bsky.social. 21.4 million women in the US live in a contraceptive access gap—where the need for low- or no-cost contraception is greater than the availability of services. More: powertodecide.org/contraceptiv...
Isaac Maddow-Zimet
@imaddowzimet.bsky.social
Data Scientist at Guttmacher; I lead the Monthly Abortion Provision Study (https://www.guttmacher.org/monthly-abortion-provision-study) but post here mainly about statistics.
Interesting: the difficulty “older” women have conceiving may be exaggerated because of selection effects Rethinking age-specific fecundability: Selection bias can generate apparent rapid decline with age austriaca.at?arp=0x0041dd...
Vienna Yearbook of Population Research 2026
The Vienna Yearbook of Population Research is an open access journal that features contributions addressing population trends as well as a broad range of theoretical and methodological issues in popul...
austriaca.at
Big changes ahead: the OSF will stop support sharing (new) data, materials and code. Feels like the end of an era!
Over the next several months, we will phase out some popular OSF features. These changes do not affect current public content, which remains safe and accessible. We have prepared support material to help users adapt. I am very sorry for the disruption to your work. Please read this post for details.
New paper alert! Vital stats only capture individual births, not people’s reproductive career. For that, demographers use surveys that collect full fertility histories. But these fertility histories are less helpful if people don’t fully report all their births or report info inaccurately. 1/
In “Reliability of Repeated Measures of Retrospective Parity,” @karenguzzo.bsky.social et al show that 1 in 5 parents reported a different parity between survey waves, split equally btw “losing” & “finding” a birth. @uncpopcenter.bsky.social @cfdr-bgsu.bsky.social read.dukeupress.edu/demography/a...
1/ ICYMI, last week the Monthly Abortion Provision Study released new 2025 data on specific flows of travel between states for abortion care; we update these detailed travel data annually, but this round, we also improved our dashboard to make them easier to use! www.guttmacher.org/monthly-abor...
Monthly Abortion Provision Study
guttmacher.org
Everyone deserves abortion access in their own communities. Since Dobbs, telehealth has been crucial to ensuring care for people across the US. But clinic-based care has eroded due to bans and clinic closures. We teamed up with @guttmacher.org to share the facts about travel for abortion care ⬇️
We need "this database is encrypted so you just need to answer a few questions based on the documentation to proceed"
Thinking about how this might go Listener: My chains aren't converging Andrew: Your model is bad Aki: Your parameterization is bad Richard: The Buddha teaches us that numerical integration is suffering
🚨 @rmcelreath.bsky.social @statmodeling.bsky.social & @avehtari.bsky.social are coming on the show mid-June to discuss their new book, Bayesian Workflow! ONE listener gets to bring a real Bayesian problem onto the recording and have the three of them work through it live. Here's how to enter 🧵
The correct attitude re: surveying AI to find out what humans think is that a lot of the time you can't even find out what humans think by surveying humans
Today is the final day in the stay of the mifepristone case. 🚨 Medication abortion is NOT going away. We know misoprostol is a safe and effective medication abortion option. ➡️ Our evidence of US-based use doi.org/10.1363/psrh... ➡️ NEJM Review of studies evidence.nejm.org/doi/full/10....
How Effective Is Misoprostol Alone for Medication Abortion?
With recent severe restrictions to abortion accessibility in the United States and a pending Supreme Court case challenging the Food and Drug Administration’s approval of mifepristone, evidence-bas...
evidence.nejm.org
This is such a great and clear thread (and also, we *always* are making choices about what dynamics we are attempting to show when we chart things, and there usually isn’t one right answer - which is why it’s great when we can show the same data in a bunch of different ways).
1/ No, the New York Times was *not* wrong about birth rates.. There has been some pushback on a recent @upshot.nytimes.com article on US birth rate trends that I think is *mostly* unfair. The original article: www.nytimes.com/2026/04/09/u... #demography
Really useful thread from one of my favorite researchers! And if you haven’t checked out her recent JAMA article, you should! jamanetwork.com/journals/jam...
Adolescent and Young Adult Requests for Medication Abortion Through Online Telemedicine
This cross-sectional study evaluates telehealth medication abortion rates among adolescents and young adults after the Dobbs v Jackson Women’s Health Organization decision by state-level restrictions ...
jamanetwork.com
I have seen a touch of confusion in the reporting and discussion around our recent study on AYA request for medication abortion from an online telemedicine service particularly in the context of new research from theGuttmacher team on the persistent increase in folks using telehealth for abortion
Getting the chance to be on @outlawedthepodcast.bsky.social to talk about our new estimates with two incredibly smart and committed abortion providers was so great (and not only because they let me talk a little bit about our methodology!)
Check out this week’s @outlawedthepodcast.bsky.social episode with @guttmacher.org data scientist @imaddowzimet.bsky.social — We had an awesome discussion about the 2025 abortion data that was just released this week! podcasts.apple.com/us/podcast/o...
In this @us.theconversation.com op-ed, @danamartha.bsky.social (@wisccore.bsky.social) and @lauralindberg.bsky.social (@rutgerssph.bsky.social) break down their research on how teens are accessing abortion pills via telehealth, why it matters, and what further research is needed. Read their piece:
Teens are driving the demand for online abortion pills via telehealth – new research
Parental involvement laws and the stigma of teen pregnancy create significant barriers for teenagers seeking abortions. These factors are pushing teens to obtain abortion pills online.
theconversation.com
Meanwhile I continue to majorly regret that I didn’t take “I Hope You Like Matrices” in college, and instead had to discover those joys on my own later in life
the actual core content of any such degree is I Hope You Like Matrices but I think people feel like it's all going to be Advanced Talking to ChatGPT and when these degrees really get underway it's going to be a structural challenge for the universities to manage this contradiction
Important new data insights from @imaddowzimet.bsky.social @kimyaf.bsky.social @guttmacher.org Telehealth remains essential With what seems to be fewer people traveling to abortion supportive states for care, and more folks accessing abortion via telehealth www.guttmacher.org/report/full-...
Full-Year Estimates Show Overall Stability in Abortion Incidence, Decreased Travel and Increased Telehealth Provision
guttmacher.org
Was really happy to get the chance to talk to NPR about our new report, which documented shifts in how residents of states with total abortion bans are accessing care www.npr.org/2026/03/24/n...
Despite state bans and restrictions, the number of abortions in the U.S. holds steady
The Guttmacher Institute has a new analysis on how many abortions happened in 2025.
npr.org
I laughed at this comic (and then realized I had already written an email this morning that had a nested set of three parentheticals (of course with matching closing parentheses (otherwise it would be unbalanced))).
I had a number of CS people tell me this read just fine for them. www.smbc-comics.com/comic/language
Nothing was more eye opening to me as a researcher than being sampled for a large, clearly well funded study and then being administered a close to *4 hour* survey.
I wish the effects of the costs of survey participation got as much scrutiny as the benefits (namely incentives), both on participation but also on data quality
Problem about the loneliness epidemic is, it's everywhere except in representative survey data. Let's look at where the claim comes from. 1/
Case in point, @pengzell.bsky.social just sent me 5 papers proving that there’s not actually any evidence for a loneliness epidemic. My mind is highly changed
Very excited that @lauralindberg.bsky.social and I just posted a preprint of a paper that we've been working on for a while, looking at the (lack of) comparability of the most recent NSFG with prior waves of data. Feedback extremely welcome! osf.io/preprints/so...
OSF
osf.io
🚨Our new paper in @jamahealthforum.com Curious about how parental involvement laws and state abortion bans shape access for teens? We found that teens living in the *most* stringent policy contexts are ordering abortion pills online at higher rates than their peers in less restrictive states
After the Dobbs decision, adolescent and young adult requests for medication abortion via telemedicine increased across all states, with the highest demand seen in states with both gestational bans and parental involvement laws. ja.ma/4rlqVH4
Two statisticians like to initialize their random number generators differently set.seed(ed) Rivalry
Two development randomistas develop a secret love affair in the field Treated Rivalry
We just released the 2025 Communities Need Clinics report. Findings show once again how essential indie abortion clinics are to access in the U.S. #IndiesProvide the majority of abortions & operate the most clinics in states w/ the harshest restrictions. They also provide most later abortion care.
According to #WeCount results from last year, 1 out of 4 abortions was provided via telehealth. “All of this legislation will never take away from the fact that women will continue to need abortion care, and continue to get abortion care.” - @ushma.bsky.social
Three Years After Dobbs, the State Divide Over Abortion Deepens
The state divide over abortions has only deepened since the Supreme Court decision. But research shows the number of abortions has climbed.
nytimes.com
This is such a great guide, with such clear examples
Big new blogpost! My guide to data visualization, which includes a very long table of contents, tons of charts, and more. --> Why data visualization matters and how to make charts more effective, clear, transparent, and sometimes, beautiful. www.scientificdiscovery.dev/p/salonis-gu...
Just published w/ my @guttmacher.org colleagues: People are deeply confused about EC: how it works, when pregnancy starts, and whether EC is “an abortion.” That fog isn’t accidental; it fuels stigma and restrictions. Knowledge matters for autonomy + access. www.sciencedirect.com/science/arti...
“You’re not necessarily pregnant”: Confusion about emergency contraception
Misconceptions about what emergency contraception does are common and have resulted in policy efforts to restrict access. Understanding the beliefs an…
sciencedirect.com