From: Association between body mass index and suicidal behaviors: a systematic review protocol
Outcome | Definition | Measurement of variable | Statistics | Studies |
---|---|---|---|---|
Completed suicide | Death caused by self-inflicted injurious behavior intended to end one’s own life | International classification of diseases (eighth, ninth, or tenth revisions) using diagnostic codes (E950-E950: ICD8, ICD9) or (X60-X84: ICD10) | Cox proportional hazard model | |
Linear regression | ||||
Logistic regression | ||||
In some studies, associations were also estimated with undetermined deaths (deaths where it was uncertain whether the cause was suicide; (E980-E989: ICD 8, ICD 10) or codes (Y10-Y34, ICD 10)) | ||||
Pearson correlation (ecological analysis) | ||||
Spearman’s rank correlation (ecological analysis) | ||||
Chi-square | ||||
Wilcoxon-Mann-Whitney test | ||||
Verified using mortality registries (for example, National Death Registry, National Death Index), by next of kin and/or using pathology and medical records. | ||||
Incidence rate ratio | ||||
Attempted suicide | Potentially self-injurious behavior with a non-fatal outcome for which there is either explicit or implicit evidence that the person intended to kill him or herself [63]. | Hospital Discharge Registries or Medical Records using aforementioned diagnostic codes for intentional injuries: (E950-E950: ICD8, ICD9) or (X60-X84: ICD10). | Cox proportional hazard model | |
Logistic regression | ||||
Incidence rate ratio | ||||
Self-reported using questionnaire (for example, Suicide Behaviours Questionnaire - Revised, AUDADIS, M-CIDI) | ||||
Self-reported using single-question (e.g. “How often have you already tried to take your own life”) | ||||
Suicidal ideation | Having thoughts, plans, and/or impulses for suicidal behavior, including contemplation of attempting or completing suicide. | Self-reported using questionnaire (for example, Depressive Symptom Index - Suicidality Subscale, Suicide Behaviors Questionnaire - Revised). | Logistic regression Linear regression | |