Errors in Coding and Classification in Research on Psilocybin Services

October 16, 2026

Jama Network Open

Overview

The authors of a study of Oregon state-regulated psilocybin services identified errors involving reasons for seeking services, race classification, and the reported number of participants with lifetime psilocybin use. They described the errors and corrections in a Comment, and the original article, including its text, tables, and supplement, has since been corrected.

Background

Oregon’s regulated psilocybin services provide a setting for evaluating service use and safety outside clinical trials. The original investigation reported mental health outcomes and adverse reactions among adults receiving services. Accurate coding and demographic classification are important to interpreting such research and its reported participant characteristics. Oregon’s reporting system also collects standardized information, including reasons for service use and demographic fields.

Data Highlights

Item	Reported correction
Reasons for seeking services	A coding error misclassified reasons for seeking services.
Race classification	A small number of participants had been incorrectly categorized as having “other” race.
Lifetime psilocybin use	The corrected report included 2 fewer participants with lifetime psilocybin use than initially reported.
Correction status	Corrections were specified for the article’s text, tables, and supplement; the article has since been corrected.

Key Findings

The errors were identified by the authors of the original investigation, “Safety and Mental Health Outcomes of Oregon State-Regulated Psilocybin Services.”
The investigation was published in JAMA Network Open on August 19, 2026.
A coding error led to misclassification of reasons for seeking services.
A small number of participants were incorrectly categorized as having “other” race.
The corrected report listed 2 fewer participants with lifetime psilocybin use than the initial report.
The authors detailed the errors and corrections in a Comment, and the original article was subsequently corrected.

Clinical Implications

The reported corrections affect the classification and description of participants and their reasons for seeking services. Readers interpreting the investigation should consult the corrected article and its revised tables and supplement.

Conclusion

The authors disclosed and corrected coding and classification errors in the Oregon psilocybin services investigation. The corrected article is the appropriate version for reference.