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Peer Self-harm Predicts a Small Increase in Adolescent Risk with a Peak at Age 16: Findings from a Nationwide Finnish Cohort
By MedXY|Nov 23, 2025
A Finnish registry cohort (n=913,149) found that exposure to same-grade schoolmates’ self-harm modestly increased later self-harm risk (HR 1.05), with the largest effect around age 16 (HR ~1.45), suggesting time-limited social transmi
