Figure 1. Overview of results.

a) Literature review results. Reported instrument correlations are shown using an undirected graph. Nodes represent the instruments studied. Edges are coloured based on the average correlation across cohorts, edge width increases with the number of studies from which the correlations were extracted. b) ENIGMA correlation results. Each node represents one of the instruments included in the study. Edge color represents the sample-size weighted average correlation coefficient between two instruments. The thickness of the edge increases with the number of cohorts contributing to estimate the correlation. Generally speaking the thicker the edge the more confidence in the correlation estimate. c) Overview of the instruments used on the enigma analyses and the amount of overlap between them. BDI:Beck Depression Inventory suicidal ideation item; SSI: Scale for Suicidal Ideation; CDRS: Children’s Depression Rating Scale suicidal ideation item; CIDI: CIDI items on suicidal ideation and behaviour; C-SSRS: Columbia Suicide Severity Rating Scale; DIGS: Diagnostic Interview for Genetics Studies items on suicidal ideation and behaviour; HAM-D: Hamilton Depression Rating Scale item on suicidal ideation; IDAS-II: Inventory of Depression and Anxiety Symptoms suicide subscale; QIDS: Quick Inventory of Depressive Symptomatology suicidal ideation item; K-SADS: Kiddie Schedule for Affective Disorders and Schizophrenia suicide items; MADRS: Montgomery-Asberg Depression Rating Scale suicidal ideation item; MINI: Mini International Neuropsychiatric Interview suicidality module; RCADS: Revised Children’s Anxiety and Depression Scale suicidal ideation item; SCID: Structured Clinical Interview for DSM Disorders suicide questions; SIQ: Suicidal Ideation Questionnaire; SIS: Beck’s Suicide Intent Scale; SITBI: Self-Injurous Thouhts and Behaviours Interview; SSS: Suicide Score Scale; YSR: Youth Self-Report suicide item; SIQ-JR: Suicidal Ideation Questionnaire-Junior.