Table 1.

Cohorts included, sample size and instruments used to assess suicidal thoughts and/or behaviours

Cohort name	Sample size	Instruments
AFFDIS	29	Hamilton Depression Rating Scale (past week), Beck Depression Inventory (past two weeks), Montgomery-Asberg Depression Rating Scale (past week)
Chiba University	117	Beck Depression Inventory-I (past week), Beck Depression Inventory-II (past two weeks), Mini International Neuropsychiatric Interview suicidality module (past month, question 6 refers to lifetime attempt)
Duke/Durham VA	190	Beck Depression Inventory (past two weeks), Beck Scale for Suicidal Ideation (past week)
EPISCA (Leiden adolescents)	71	Children's Depression Inventory (past two weeks), Youth Self-report (lifetime), Revised Children’s Anxiety and Depression Scale (lifetime)
ETPB-STB	60	Hamilton Depression Rating Scale (past week), Scale for Suicidal Ideation (past week), Beck Depression Inventory (past week), Montgomery-Asberg Depression Rating Scale (past week)
FIDMAG	284	Hamilton Depression Rating Scale (past week), Montgomery-Asberg Depression Rating Scale (past week)
FOR2107 Muenster	424	Hamilton Depression Rating Scale (past week), Beck Depression Inventory (past week)
FOR2107 Marburg	792	Hamilton Depression Rating Scale (past week), Beck Depression Inventory (past week)
Grady Trauma Project Emory University	123	Beck Depression Inventory (past two weeks), Columbia Suicide Severity Rating Scale (past month)
The University of Melbourne	283	Quick Inventory of Depressive Symptoms (past week), Suicidal Ideation Questionnaire (lifetime), Columbia Suicide Severity Rating Scale (past month and lifetime), Montgomery-Asberg Depression Rating Scale (past week)
University of Minnesota Adolescent MDD	110	Children’s Depression Rating Scale (past week), Beck Depression Inventory (past two weeks), Kiddie Schedule for Affective Disorders and Schizophrenia (lifetime), Inventory of Depression and Anxiety Symptoms (past two weeks)
CHU Montpellier BICS study	66	Inventory of Depressive Symptoms - Clinician rated (past week), Beck Depression Inventory (current), Columbia Suicide Severity Rating Scale (lifetime & last month)
CHU Montpellier IMPACT study	40	Quick Inventory of Depressive Symptoms (past week), Inventory of Depressive Symptoms - Clinician rated (past week), Columbia Suicide Severity Rating Scale (last month)
CHU Montpellier Servier Study	120	Hamilton Depression Rating Scale (past week), Beck Depression Inventory (past week), Scale for Suicidal Ideation (past week)
McGill University	103	Beck Depression Inventory (past two weeks), Suicide Intent Scale (most recent attempt and most severe attempt), Scale for Suicidal Ideation (today and in the past two weeks), Quick Inventory of Depressive Symptoms (past week), Montgomery-Asberg Depression Rating Scale (past week), Hamilton Depression Rating Scale (past week), Columbia Suicide Severity Rating Scale (past month and lifetime)
Moral Dilemma	62	Quick Inventory of Depressive Symptoms (past week), Montgomery-Asberg Depression Rating Scale (past week)
Muenster Neuroimaging Cohort	1064	Hamilton Depression Rating Scale (past week), Beck Depression Inventory (past week), Montgomery-Asberg Depression Rating Scale (past week)
Fondazione Santa Lucia	288	Suicide Score Scale (past year), Mini International Neuropsychiatric Interview suicidality module (past month)
San Raffaele Hospital	447	Hamilton Depression Rating Scale (past week), Beck Depression Inventory (past two weeks), Beck Scale for Suicidal Ideation (day of assessment)
SoCAT	179	Hamilton Depression Inventory (past week), Beck Depression Inventory (past two weeks)
South Africa	117	Diagnostic Interview for Genetic Studies (lifetime), Montgomery-Asberg Depression Rating Scale (past week)
Stanford University adolescent MDD TIGER	49	Columbia Suicide Severity Rating Scale (lifetime & current (ideation in the past week, attempt in the past month), Self-Injurious Thoughts and Behaviours Interview (lifetime)
Stanford University AGG/FAA	56	Structured Clinical Interview for DSM Disorders (lifetime), Hamilton Depression Rating Scale (past week)
STRADL	1188	Structured Clinical Interview for DSM DIsorders (past month), Quick Inventory of Depressive Symptoms (past week)
Sydney Bipolar Risk Study	225	Kiddie Schedule for Affective Disorders and Schizophrenia (lifetime), Diagnostic Interview for Genetic Studies (lifetime), Montgomery-Asberg Depression Rating Scale (lifetime)
UCSF Adolescent MDD	161	Beck Depression Inventory (two weeks), Columbia Suicide Severity Scale (lifetime and current (ideation in the past week, attempt in the past two weeks))
Yale School of Medicine	178	Beck Scale for Suicidal Ideation (past month and lifetime), Suicide Intent Scale (most recent attempt, most lethal attempt), Columbia Suicide Severity Rating Scale (lifetime & past month), Hamilton Depression Rating Scale (past week), Child Depression Rating Scale (past week)