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Isaac Maddow-Zimet

@imaddowzimet.bsky.social
1.7K followers 236 following 101 posts

Data Scientist at Guttmacher; I lead the Monthly Abortion Provision Study (www.guttmacher.org/monthly-abortion…) but post here mainly about statistics.

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Reposted by Isaac Maddow-Zimet
Guttmacher @guttmacher.org · 16/09/2026
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...
Pink and navy blue text at the top says, "Contraceptive Access Maps: Access to publicly funded clinics offering any contraceptive services." A map of the United States with color coding to show which counties have the highest and lowest access to these services. Below the map, pink text says, "21.4 million women in need live in a contraceptive access gap." At the bottom are logos for Power to Decide and Guttmacher, and white text says, "Learn more at powertodecide.org." Pink and navy blue text at the top says, "Contraceptive Access Maps: Access to publicly funded clinics offering the full range of contraceptive services." A map of the United States with color coding to show which counties have the highest and lowest access to these services. Below the map, pink text says, "21.4 million women in need live in a contraceptive access gap." At the bottom are logos for Power to Decide and Guttmacher, and white text says, "Learn more at powertodecide.org."
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Isaac Maddow-Zimet @imaddowzimet.bsky.social · 04/09/2026
A campaign slogan I can get behind
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Reposted by Isaac Maddow-Zimet
Rebecca Sear @rebeccasear.bsky.social · 19/08/2026
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...
austriaca.at
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...
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Reposted by Isaac Maddow-Zimet
Julia M. Rohrer @dingdingpeng.the100.ci · 11/08/2026
Big changes ahead: the OSF will stop support sharing (new) data, materials and code. Feels like the end of an era!
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Karen Benjamin Guzzo @karenguzzo.bsky.social · 07/08/2026
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/
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Isaac Maddow-Zimet @imaddowzimet.bsky.social · 31/07/2026
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...
guttmacher.org
Monthly Abortion Provision Study
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Abortion Care Network @abortioncare.bsky.social · 23/07/2026
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 ⬇️
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Thomas Lumley @tslumley.bsky.social · 28/06/2026
We need "this database is encrypted so you just need to answer a few questions based on the documentation to proceed"
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Richard McElreath 🐈‍⬛ @rmcelreath.bsky.social · 28/05/2026
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
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Leslie Root @lesja.bsky.social · 14/05/2026
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
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Dana M. Johnson @danamartha.bsky.social · 11/05/2026
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....
evidence.nejm.org
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...
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Isaac Maddow-Zimet @imaddowzimet.bsky.social · 01/05/2026
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).
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Isaac Maddow-Zimet @imaddowzimet.bsky.social · 01/04/2026
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...
jamanetwork.com
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 ...
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Isaac Maddow-Zimet @imaddowzimet.bsky.social · 30/03/2026
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!)
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Scholars Strategy Network @scholars.org · 26/03/2026
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:
theconversation.com
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.
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Isaac Maddow-Zimet @imaddowzimet.bsky.social · 25/03/2026
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
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Reposted by Isaac Maddow-Zimet
Dana M. Johnson @danamartha.bsky.social · 24/03/2026
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-...
guttmacher.org
Full-Year Estimates Show Overall Stability in Abortion Incidence, Decreased Travel and Increased Telehealth Provision
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Isaac Maddow-Zimet @imaddowzimet.bsky.social · 24/03/2026
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...
npr.org
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.
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Isaac Maddow-Zimet @imaddowzimet.bsky.social · 24/02/2026
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))).
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Isaac Maddow-Zimet @imaddowzimet.bsky.social · 21/02/2026
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.
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Per Engzell @pengzell.bsky.social · 17/02/2026
Problem about the loneliness epidemic is, it's everywhere except in representative survey data. Let's look at where the claim comes from. 1/
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Isaac Maddow-Zimet @imaddowzimet.bsky.social · 16/02/2026
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.io
OSF
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Dana M. Johnson @danamartha.bsky.social · 14/02/2026
🚨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
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Isaac Maddow-Zimet @imaddowzimet.bsky.social · 14/02/2026
Roses are pink And so are crassula perforata
Jornal article: Analyses of change scores do not estimate causal effects in observational data
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Isaac Maddow-Zimet @imaddowzimet.bsky.social · 14/02/2026
Roses are red Heliamphora like fruit flies
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Isaac Maddow-Zimet @imaddowzimet.bsky.social · 06/02/2026
Two statisticians like to initialize their random number generators differently set.seed(ed) Rivalry
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Reposted by Isaac Maddow-Zimet
Abortion Care Network @abortioncare.bsky.social · 09/12/2025
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.
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ANSIRH @ansirh.bsky.social · 09/12/2025
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
nytimes.com
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.
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Isaac Maddow-Zimet @imaddowzimet.bsky.social · 10/12/2025
This is such a great guide, with such clear examples
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Reposted by Isaac Maddow-Zimet
Laura Lindberg @lauralindberg.bsky.social · 09/12/2025
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...
sciencedirect.com
“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…
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Reposted by Isaac Maddow-Zimet
Kimya Forouzan @kimyaf.bsky.social · 10/09/2025
Shield laws have become a lifeline for abortion patients and providers in the US post-Dobbs, which is precisely why conservative policymakers are turning to the courts, Congress, and state legislatures to attack this critical method of care. 🧵 www.guttmacher.org/2025/09/atta...
guttmacher.org
Attacks on Shield Laws Are the Next Step in Criminalizing Abortion Care
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Isaac Maddow-Zimet @imaddowzimet.bsky.social · 27/08/2025
Proud to have signed on to this letter, along with many other colleagues in the field (including @guttmacher.org researchers @cbpolis.bsky.social , @megankavanaugh.bsky.social, Kathryn Kost, Rachel Jones, Ann Moore and Beth Sully)
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Laura Lindberg @lauralindberg.bsky.social · 20/08/2025
Check out our new brief @ccfamilies.bsky.social on the limitations of population projections for understanding future fertility patterns. The growing public discourse on declining fertility needs demographers voices and expertise, while recognizing the limits of our methods.
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A Jean Stevenson @amandajean.bsky.social · 20/08/2025
Are we doomed to a demographic destiny of decline because ladies aren't having babies? No. We've been here before. It turns out that population projections only describe one of many possible futures. Our actual future is still to be written.
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Karen Benjamin Guzzo @karenguzzo.bsky.social · 20/08/2025
Feeling alarmed over dire long-term population projections that suggest humanity will disappear? Don't be! Demographers generally aren't worried, and you shouldn't be either. @amandajean.bsky.social explains why in this great @ccfamilies.bsky.social brief. sites.utexas.edu/contemporary...
Don’t Panic: Population Projection is Not a Crystal Ball

August 20th, 2025

Population panic – worries about “depopulation” linked to low birth rates – has become pervasive, with dire predictions in both the short and long term. Yet demographers like us – experts who explicitly study population size, composition, and structure – are generally not highly concerned. Why is this? It’s because we understand the strengths and limitations of population projections. Projections can accurately describe how populations will change if we know future birth, death, and migration rates. But demographers are well aware that they don’t have a crystal ball – we can’t fully anticipate economic shifts, political changes, global events, or how future generations will respond to their changing worlds. That’s why the farther we project from the present, the less accurate those projections are likely to be.
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Isaac Maddow-Zimet @imaddowzimet.bsky.social · 06/08/2025
Really enjoyed talking to Lizzy McNeill on the BBC More or Less podcast about trends in abortion provision post Dobbs (along with @ushma.bsky.social !) podcasts.apple.com/us/podcast/a...
podcasts.apple.com
Are abortion numbers rising in the US?
Podcast Episode · More or Less: Behind the Stats · 08/06/2025 · 9m
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Karen Benjamin Guzzo @karenguzzo.bsky.social · 25/07/2025
Want to know why demographers aren't panicking over low birth rates? @lesja.bsky.social, @shelleydclark.bsky.social, & I have a new piece in @theconversation.com explaining the faulty logic that underlies the low birth rate-induced population panic than fuels the pronatalism movement. 1/n
theconversation.com
Fears that falling birth rates in US could lead to population collapse are based on faulty assumptions
While the changes in population structure that accompany low birth rates are real, the impact of these changes has been dramatically overstated.
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Isaac Maddow-Zimet @imaddowzimet.bsky.social · 09/07/2025
This is such a great thoughtful and nuanced post by @rmcelreath.bsky.social on open science/computational reproducibility - especially on the need to make research and code *intelligible*, not just transparent. elevanth.org/blog/2025/07...
Comprehensibility of research. This is not transparency nor openness. What I mean is research has sufficient documentation and justification to reduce error and empower others to make up their own minds about its value. Research should be intelligible. Access is not sufficient. Research can be replicable without being reasonable or correct. Materials and data can be open without being intelligible, and they can be partly closed while still being comprehensible. The rise of AI reinforces the need for comprehensibility, because “I asked the chatbot” is not comprehensible. But for sure AI will be a part of scientific workflow now and into the future. But the researcher must be responsible, not the bot.
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Karen Benjamin Guzzo @karenguzzo.bsky.social · 02/07/2025
Journalists often ask for my thoughts on the contemporary US pronatalist movement. My assessment is based on my expertise and training as a social demographer, and my own research on childbearing behaviors at the individual and aggregate levels. Strap in, b/c I've got a lot to say. 1/
media.tenor.com
a woman says let 's get into it with a pinkvilla logo in the background
ALT: a woman says let 's get into it with a pinkvilla logo in the background
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Dana M. Johnson @danamartha.bsky.social · 30/06/2025
As mifepristone continues to be threatened (read: RFK Jr's baseless/insane claims about safety) more folks are considering the role of misoprostol-only medication abortion regimens in the US Well happy Monday folks because I have *two* new studies out for you: (1/4)
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Per Engzell @pengzell.bsky.social · 28/06/2025
Being a social scientist means holding two truths at once: 1. This is all deeply complicated 2. I have to submit something by Tuesday
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Dana M. Johnson @danamartha.bsky.social · 26/06/2025
New: SCOTUS *allows* states to defund Planned Parenthood, holding that Medicaid does not give patients a right to obtain care from its providers. Back in April Terri-Ann and I wrote about the public health implications of this ruling - and trust us…they are major thehill.com/opinion/5235...
thehill.com
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The Washington Post @washingtonpost.com · 25/06/2025
More than 150,000 people traveled out of state to get an abortion last year, nearly one-fifth of whom coming from Texas alone — and new numbers paint a picture of how far they went to receive care. It’s been three years since the Supreme Court overturned Roe v. Wade. wapo.st/3TCXhxF
Protestors holding signs advocating for abortion rights in front of the United States Capitol building at dusk. The text reads, “Three years ago, Toe v. Wade was overturned. More than 1 in 7 abortion patients travel to other states, a recent study found.” Photo by Annie Mulligan for The Washington Post.A map of the United States showing the legal status of abortion by state. States are color-coded: red indicates a ban on all or most abortions, dark grey signifies a ban on abortions after 12 or 15 weeks, light grey indicates the ban is blocked by courts, and white means abortions are legal.
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Emma S-E @emmas-e.bsky.social · 24/06/2025
Everyone deserves access to abortion care in their communities via their preferred method, whether that is an in clinic procedure, via telemedicine, or abortion pills sourced form a community network. Any restrictions that limit people's choices are unjust. Full stop.
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Leslie Root @lesja.bsky.social · 24/06/2025
Just looking at the map (article is paywalled, unfortunately): God bless Carbondale, and all of southern Illinois
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Isaac Maddow-Zimet @imaddowzimet.bsky.social · 24/06/2025
And as #WeCount and others have documented - the increased availability of telehealth through shield law providers is likely playing a big role here as well: helping many people access abortion care who would have otherwise traveled very far distances or not been able to access care at all.
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Isaac Maddow-Zimet @imaddowzimet.bsky.social · 24/06/2025
Three years post Dobbs, enormously high numbers of people are still crossing state lines to access abortion care: the Monthly Provision Study just released new data on where they are coming from and where they are going. www.cnn.com/2025/06/24/h...
cnn.com
Tens of thousands of women traveled for abortion care again last year as state policies continue to shift | CNN
More than 1 in 7 people who had an abortion in the United States last year crossed state lines to do so, according to new estimates from the Guttmacher Institute, a research and policy organization fo...
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Isaac Maddow-Zimet @imaddowzimet.bsky.social · 10/06/2025
@doctorshelleysella.bsky.social's book is probably one of the best things I've read in the past decade.
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Isaac Maddow-Zimet @imaddowzimet.bsky.social · 09/06/2025
I saw my city council member biking across the bridge in the other direction from me on my way back from work today and I truly have never been so excited by a celebrity sighting
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Jasmin Abdel Ghany @jasminabdelghany.bsky.social · 26/05/2025
The Demographic and Health Survey (DHS) Program was central in improving the evidence base for health policies and interventions, particularly in Sub-Saharan Africa and Central & Southern Asia - figure by @aasli.bsky.social. Our preprint on the termination of the DHS Program: osf.io/preprints/so...
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