About The Study: The findings of this cohort study suggest that peer environments, particularly in upper secondary school settings, are associated with mental health trajectories. More research is needed to elucidate the mechanisms underlying these findings.
Corresponding Author: To contact the corresponding author, Jussi Alho, PhD, email jussi.alho@helsinki.fi.
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(10.1001/jamapsychiatry.2026.1752)
Editor’s Note: Please see the article for additional information, including other authors, author contributions and affiliations, conflict of interest and financial disclosures, and funding and support.
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Journal
JAMA Psychiatry