The primary outcomes were suicidal ideation, suicide attempt, and completed suicide. A suicidal ideation is "thinking about, considering, or planning for suicide" [16]. A suicide attempt is "a non-fatal self-directed potentially injurious behavior with any intent to die as a result of the behavior" [16]. A completed suicide is "a death caused by self-directed injurious behavior with any intent to die as a result of the behavior" [16]. The death due to overdose without intent to die was not included. The studies reporting suicide as a general term without distinguishing between suicidal ideation, suicide attempt, or completed suicide were excluded.
