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Venn diagram showing participant overlap between the four major depressive disorder (MDD) categories in UK Biobank Mental Health Questionnaire (MHQ) respondents who met criteria for lifetime MDD (N = 29 471). The MDD categories include MDD with reported trauma (N = 13 391), MDD without reported trauma (N = 9486), recurrent MDD (N = 17 449) and single-episode MDD (N = 12 022).
