Viktor H. Ahlqvist
@ahlqvistviktor.bsky.social
Epidemiology @Aarhus & @Karolinska
Pinned
Trump links autism and Tylenol: is there any truth to it?
The US president calls the widely used painkiller, also known as paracetamol, ‘a very big factor’ in autism, but scientists say that strong evidence is lacking.
www.nature.com
I provided some comments on the #paracetamol and #autism debacle in Nature:
www.nature.com/articles/d41...
www.nature.com/articles/d41...
Fantastic work by @pmadleydowd.bsky.social ! If you're into multiple imputation - look this way
Have you ever tried to implement multiple imputation with several incomplete variables? How do you know whether MI will be valid for your data? We have just published an easy to use algorithm using modifications to DAGs (now they're colourful) to aid decision making with MI
doi.org/10.1093/aje/...
doi.org/10.1093/aje/...
November 26, 2025 at 2:37 PM
Fantastic work by @pmadleydowd.bsky.social ! If you're into multiple imputation - look this way
Reposted by Viktor H. Ahlqvist
Have you ever tried to implement multiple imputation with several incomplete variables? How do you know whether MI will be valid for your data? We have just published an easy to use algorithm using modifications to DAGs (now they're colourful) to aid decision making with MI
doi.org/10.1093/aje/...
doi.org/10.1093/aje/...
November 26, 2025 at 11:37 AM
Have you ever tried to implement multiple imputation with several incomplete variables? How do you know whether MI will be valid for your data? We have just published an easy to use algorithm using modifications to DAGs (now they're colourful) to aid decision making with MI
doi.org/10.1093/aje/...
doi.org/10.1093/aje/...
Reposted by Viktor H. Ahlqvist
I provided some comments on the #paracetamol and #autism debacle in Nature:
www.nature.com/articles/d41...
www.nature.com/articles/d41...
Trump links autism and Tylenol: is there any truth to it?
The US president calls the widely used painkiller, also known as paracetamol, ‘a very big factor’ in autism, but scientists say that strong evidence is lacking.
www.nature.com
September 22, 2025 at 8:42 PM
I provided some comments on the #paracetamol and #autism debacle in Nature:
www.nature.com/articles/d41...
www.nature.com/articles/d41...
For those of you using sibling analysis, perhaps you'll find this useful 🥳: www.medrxiv.org/content/10.1...
Moving beyond risk ratios in sibling analysis: estimating clinically useful measures from family-based analysis
Objective: Findings from family-based analyses, such as sibling comparisons, are often reported using only odds ratios or hazard ratios. We demonstrate how this can be improved upon by applying the ma...
www.medrxiv.org
May 17, 2025 at 9:00 AM
For those of you using sibling analysis, perhaps you'll find this useful 🥳: www.medrxiv.org/content/10.1...
Fantastic news! This is entirely attributable to all my colleagues—everyone from mentors to students—who have made this possible🎉🎉
news.ki.se/safer-medica...
news.ki.se/safer-medica...
Safer medications for pregnant women and children
Viktor H. Ahlqvist, postdoc at the Institute of Environmental Medicine (IMM), receives 3,000,000 SEK in a Postdoctoral Grant from the Swedish Society for Medical Research (SSMF) for the project “Advan...
news.ki.se
March 27, 2025 at 3:18 PM
Fantastic news! This is entirely attributable to all my colleagues—everyone from mentors to students—who have made this possible🎉🎉
news.ki.se/safer-medica...
news.ki.se/safer-medica...
Doing multiple imputation? Do your auxiliary variables also have missing?! Check out this brilliant paper by Paul et al.
#episky
#episky
Final version published so time to talk about it: doi.org/10.1093/aje/...
When using multiple imputation to account for missing data we often use auxiliary variables (variables included in the imputation model but not the analysis model) to 1) reduce bias and 2) improve statistical efficiency.
When using multiple imputation to account for missing data we often use auxiliary variables (variables included in the imputation model but not the analysis model) to 1) reduce bias and 2) improve statistical efficiency.
Analyses using multiple imputation need to consider missing data in auxiliary variables
Abstract. Auxiliary variables are used in multiple imputation (MI) to reduce bias and increase efficiency. These variables may often themselves be incomple
doi.org
February 19, 2025 at 5:06 PM
Doing multiple imputation? Do your auxiliary variables also have missing?! Check out this brilliant paper by Paul et al.
#episky
#episky
Great end-of-year news (yes, I'm bragging—but I can't hold back my excitement over this team effort): Our paper on acetaminophen safety was one of the most popular in *JAMA* this year! jamanetwork.com/journals/jam...
#EpiSky
#EpiSky
December 17, 2024 at 10:29 PM
Great end-of-year news (yes, I'm bragging—but I can't hold back my excitement over this team effort): Our paper on acetaminophen safety was one of the most popular in *JAMA* this year! jamanetwork.com/journals/jam...
#EpiSky
#EpiSky
Reposted by Viktor H. Ahlqvist
New research out on antiseizure medications in pregnancy 🎉🎉
Nature Communications: nature.com/articles/s41...
Thread follows 🧵 🧵:
Nature Communications: nature.com/articles/s41...
Thread follows 🧵 🧵:
November 20, 2024 at 5:09 PM
New research out on antiseizure medications in pregnancy 🎉🎉
Nature Communications: nature.com/articles/s41...
Thread follows 🧵 🧵:
Nature Communications: nature.com/articles/s41...
Thread follows 🧵 🧵:
New research out on antiseizure medications in pregnancy 🎉🎉
Nature Communications: nature.com/articles/s41...
Thread follows 🧵 🧵:
Nature Communications: nature.com/articles/s41...
Thread follows 🧵 🧵:
November 20, 2024 at 5:09 PM
New research out on antiseizure medications in pregnancy 🎉🎉
Nature Communications: nature.com/articles/s41...
Thread follows 🧵 🧵:
Nature Communications: nature.com/articles/s41...
Thread follows 🧵 🧵:
On Friday (26/1) at 09:00, I'll be defending my thesis at
Karolinska Institutet. I can guarantee a hardcore epi showdown, with experts in the field reviewing me. Fingers crossed I make it out the other side! More details here: tinyurl.com/3jveu2vy
Karolinska Institutet. I can guarantee a hardcore epi showdown, with experts in the field reviewing me. Fingers crossed I make it out the other side! More details here: tinyurl.com/3jveu2vy
Doctoral thesis defence: Viktor H. Ahlqvist
Welcome to Viktor H. Ahlqvist’s public defence.
tinyurl.com
January 24, 2024 at 11:53 AM
On Friday (26/1) at 09:00, I'll be defending my thesis at
Karolinska Institutet. I can guarantee a hardcore epi showdown, with experts in the field reviewing me. Fingers crossed I make it out the other side! More details here: tinyurl.com/3jveu2vy
Karolinska Institutet. I can guarantee a hardcore epi showdown, with experts in the field reviewing me. Fingers crossed I make it out the other side! More details here: tinyurl.com/3jveu2vy
News from us:
We find a link between a common pregnancy liver disorder (intrahepatic cholestasis) and offspring neurodevelopmental conditions, especially in instances when it is diagnosed early in pregnancy. Full-text: journals.plos.org/plosmedicine...
We find a link between a common pregnancy liver disorder (intrahepatic cholestasis) and offspring neurodevelopmental conditions, especially in instances when it is diagnosed early in pregnancy. Full-text: journals.plos.org/plosmedicine...
Maternal intrahepatic cholestasis of pregnancy and neurodevelopmental conditions in offspring: A pop...
In this Swedish register-based cohort study, Shuyun Chen, Viktor H. Ahlqvist and colleagues assess the association between maternal intrahepatic cholestasis of pregnancy and neurodevelopmental disorde...
journals.plos.org
January 16, 2024 at 9:20 PM
News from us:
We find a link between a common pregnancy liver disorder (intrahepatic cholestasis) and offspring neurodevelopmental conditions, especially in instances when it is diagnosed early in pregnancy. Full-text: journals.plos.org/plosmedicine...
We find a link between a common pregnancy liver disorder (intrahepatic cholestasis) and offspring neurodevelopmental conditions, especially in instances when it is diagnosed early in pregnancy. Full-text: journals.plos.org/plosmedicine...
Reposted by Viktor H. Ahlqvist
Att ha normal vikt och bra kondition är kopplat till minskad risk för hjärt-/kärlsjukdom. Frågan är dock om det är viktigast att förbättra din vikt eller din kondition för att minska sjukdomsrisken. En ny studie har tittat på frågan.
youtu.be/fC31F7lSs5o
youtu.be/fC31F7lSs5o
Är förbättrad vikt eller förbättrad kondition bäst för hälsan?
Att ha normal vikt och bra kondition är kopplat till minskad risk för hjärt-/kärlsjukdom. Frågan är dock om det är viktigast att förbättra din vikt eller din...
youtu.be
November 27, 2023 at 5:57 AM
Att ha normal vikt och bra kondition är kopplat till minskad risk för hjärt-/kärlsjukdom. Frågan är dock om det är viktigast att förbättra din vikt eller din kondition för att minska sjukdomsrisken. En ny studie har tittat på frågan.
youtu.be/fC31F7lSs5o
youtu.be/fC31F7lSs5o
New's from us, correlations do not equal causation: news.ki.se/benefits-of-...
Benefits of adolescent fitness to future cardiovascular health possibly overestimated
There is a well-known relationship between good physical fitness at a young age and a lower risk of cardiovascular disease later in life. However, when researchers adjusted for familial factors by mea...
news.ki.se
November 20, 2023 at 9:24 AM
New's from us, correlations do not equal causation: news.ki.se/benefits-of-...