Viktor H. Ahlqvist @ahlqvistviktor.bsky.social · 23/04/2026jamanetwork.com/journals/jam...jamanetwork.comAI Drug Safety in PregnancyJAMA and JAMA+ AI Associate Editor Yulin Hswen, ScD, MPH, spoke with Viktor H. Ahlqvist, PhD, a postdoctoral fellow in the Unit of Integrative Epidemiology of the Institute of Environmental Medicine a... 010
Reposted by Viktor H. AhlqvistJAMA @jama.com · 07/01/2026Sibling comparisons are a method used in observational studies to address confounding by shared familial factors such as genetics, early-life environment, and socioeconomic status. 📊 Learn more in this JAMA Guide to Statistics and Methods: ja.ma/4jojGuQ 063
Viktor H. Ahlqvist @ahlqvistviktor.bsky.social · 26/11/2025Fantastic work by @pmadleydowd.bsky.social ! If you're into multiple imputation - look this way 010
Reposted by Viktor H. AhlqvistPaul Madley-Dowd @pmadleydowd.bsky.social · 26/11/2025Have 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/... 121
Viktor H. Ahlqvist @ahlqvistviktor.bsky.social · 24/09/2025theconversation.com/paracetamol-...theconversation.comParacetamol use during pregnancy not linked to autism, our study of 2.5 million children showsOur research provides strong evidence against the concerning claims made recently by US president Donald Trump. 041
Reposted by Viktor H. AhlqvistNature [Unofficial] @nature.com.web.brid.gy · 23/09/2025nature.comTrump links autism and Tylenol: is there any truth to it?Nature, Published online: 22 September 2025; doi:10.1038/d41586-025-02876-1 The US president repeatedly advised people, “Don't take Tylenol,” but scientists say that strong evidence between the medication and autism is lacking. 013
Viktor H. Ahlqvist @ahlqvistviktor.bsky.social · 22/09/2025I provided some comments on the #paracetamol and #autism debacle in Nature: www.nature.com/articles/d41...nature.comTrump 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. 133
Viktor H. Ahlqvist @ahlqvistviktor.bsky.social · 17/05/2025For those of you using sibling analysis, perhaps you'll find this useful 🥳: www.medrxiv.org/content/10.1...medrxiv.orgMoving beyond risk ratios in sibling analysis: estimating clinically useful measures from family-based analysisObjective: 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... 151
Viktor H. Ahlqvist @ahlqvistviktor.bsky.social · 27/03/2025Fantastic 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.seSafer medications for pregnant women and childrenViktor 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... 381
Viktor H. Ahlqvist @ahlqvistviktor.bsky.social · 19/02/2025Doing multiple imputation? Do your auxiliary variables also have missing?! Check out this brilliant paper by Paul et al. #episky 020
Viktor H. Ahlqvist @ahlqvistviktor.bsky.social · 17/12/2024Great 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 170
Reposted by Viktor H. AhlqvistViktor H. Ahlqvist @ahlqvistviktor.bsky.social · 20/11/2024New research out on antiseizure medications in pregnancy 🎉🎉 Nature Communications: nature.com/articles/s41... Thread follows 🧵 🧵: 2184
Viktor H. Ahlqvist @ahlqvistviktor.bsky.social · 20/11/2024New research out on antiseizure medications in pregnancy 🎉🎉 Nature Communications: nature.com/articles/s41... Thread follows 🧵 🧵: 2184
Viktor H. Ahlqvist @ahlqvistviktor.bsky.social · 24/01/2024On 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/3jveu2vytinyurl.comDoctoral thesis defence: Viktor H. AhlqvistWelcome to Viktor H. Ahlqvist’s public defence. 010
Viktor H. Ahlqvist @ahlqvistviktor.bsky.social · 16/01/2024News 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...journals.plos.orgMaternal 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... 041
Reposted by Viktor H. AhlqvistWille Valkeaoja @williamvalkeaoja.bsky.social · 27/11/2023Att 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/fC31F7lSs5oyoutu.beÄr 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... 163
Viktor H. Ahlqvist @ahlqvistviktor.bsky.social · 20/11/2023New's from us, correlations do not equal causation: news.ki.se/benefits-of-...news.ki.seBenefits of adolescent fitness to future cardiovascular health possibly overestimatedThere 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... 020
