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Body Mass Index Is an Important Predictor for Suicide: Results from a Systematic Review and Meta-Analysis

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SUICIDE AND LIFE-THREATENING BEHAVIOR
卷 46, 期 6, 页码 697-736

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WILEY
DOI: 10.1111/sltb.12244

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  1. Canadian Institute for Health Research (CIHR) [201303MTP-303860-182743]
  2. Brain and Behavior Research Foundation Young Investigator [19058]

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Public health concerns for the independent management of obesity and suicidal behavior are rising. Emerging evidence suggests body weight plays an important role in quantifying the risk of suicide. In light of these findings, we aimed to clarify the association between body mass index (BMI) and suicidal behavior by systematically reviewing and evaluating the literature. Studies were identified by searching MEDLINE, EMBASE, PsycINFO, and CINAHL from inception to January 2015, supplemented by hand and grey literature searches. Study screening, data extraction, and risk of bias assessment were conducted in duplicate. We included 38 observational studies. Meta-analyses supported an inverse association between BMI and completed suicide. Pooled summary estimates demonstrated that underweight was significantly associated with an increased risk of completed suicide (HR=1.21, 95% CI 1.07 to 1.36, p=.002), and obesity (HR=0.71, 95% CI 0.56 to 0.89, p=.003) and overweight (HR=0.78, 95% CI 0.75 to 0.82, p<.0001) were significantly associated with a decreased risk of completed suicide relative to normal weight. A qualitative summary of the literature demonstrated conflicting evidence regarding the association between BMI and attempted suicide and revealed no association between BMI and suicidal ideation. BMI may be used to aid the assessment of suicide risk, especially that of completed suicide. However, unmeasured confounders and systematic biases of individual studies limit the quality of evidence.

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