Curves representing the median, 25th, and 75th percentiles and peak age at onset for mental disorder spectra are reported in Figs. 1–4. The peak and median age at onset for any mental disorder were 14.5 years and 18 years. The earliest age peaks of disorder onset were: neurodevelopmental disorders (peak = 5.5/median = 12 years), anxiety/fear-related disorders (peak = 5.5/median = 17 years), obsessive-compulsive/related disorders (peak = 14.5/median = 18 years), feeding/eating disorders (peak = 15.5/median = 18 years), disorders specifically associated with stress (peak = 15.5/median = 30 years), substance use/addictive behaviour disorders (peak = 19.5/median = 25 years), schizophrenia-spectrum/primary psychotic and personality disorders/traits (peak = 20.5/median = 25 years), and mood disorders (peak = 20.5/median = 31 years). Second age peaks emerged for any mental disorder at (peak = 30.5 years), anxiety/fear-related disorders (peak = 15.5 years), obsessive-compulsive/related disorders (peak = 49.5 years), disorders specifically associated with stress (peaks = 30.5 and 49.5 years), and substance use/addictive behaviour disorders (peak = 44.5 years).
