Drug Overdose Deaths in Pregnancy

A Preprint on Pregnancy and Overdose Deaths Was Withdrawn Due to Error

A new preprint study aimed to map a significant public health crisis: fatal overdoses and substance use disorder deaths among pregnant and recently pregnant women. The work, titled “Geographic variation in pregnancy associated overdose and substance use disorder mortality, 2016 to 2022,” was posted on the medRxiv preprint server on April 24, 2026. However, the authors—M. R. Kramer, E. N. Peterson, and H. L. Cooper—have withdrawn the manuscript. The withdrawal notice states that statistical software coding errors were discovered after submission, specifically in the method used to aggregate overdose deaths. They do not wish the work to be cited.

The Original Goal: Measuring a Hidden Crisis

The study’s intended focus was on a population often overlooked in broader substance use statistics: women who are pregnant or within one year postpartum. Deaths in this group affect maternal mortality rates, infant and child health, and family stability. The researchers planned to analyze data from 2016 to 2022 to identify which U.S. states or regions had higher or lower rates of these deaths. Such geographic analysis can help direct resources and policy interventions to areas with the greatest need. The existence of the preprint, even in withdrawn form, confirms that researchers are actively working to quantify this problem.

Why Withdrawing a Study Is a Sign of Scientific Integrity

The authors’ decision to withdraw their manuscript is a direct application of a core scientific principle: correcting errors transparently. The discovery of a mistake in the aggregation of overdose deaths means the resulting maps, rates, and comparisons would be unreliable. Publishing or citing incorrect geographic patterns could mislead public health efforts and waste resources. By withdrawing the study and clearly stating the reason, Kramer, Peterson, and Cooper prevent the spread of potentially harmful misinformation. This action, while halting the immediate dissemination of findings, reinforces the cautious and corrective nature of responsible science.

The Path Forward for Research on Pregnancy and Substance Use

This event does not reduce the importance of the research question. Substance use disorder and overdose are leading causes of maternal mortality in the United States. Accurate, peer-reviewed studies are essential to understand which communities are most affected and why. Future work in this area will need to carefully validate data collection and statistical coding. It also points to the value of the preprint system itself, which allows for early sharing and scrutiny of research before formal publication. For parents, healthcare providers, and policymakers, the need for clear, correct data on this issue remains urgent. The scientific process, including steps like this withdrawal, aims to ensure that the information they eventually rely on is sound.

The withdrawal serves as a reminder for all who consume science news, especially from preprints: initial findings are provisional. For topics directly affecting child development and family health, like maternal overdose mortality, waiting for peer-reviewed, verified results is a necessary step for trust and accuracy.

Source:
WITHDRAWN: Geographic variation in pregnancy associated overdose and substance use disorder mortality, 2016 to 2022 (medRxiv preprint, 2026-04-24)