自殺は伝染するか？ : 自殺念慮の計量分析から

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  • Are Suicidal Behaviors Contagious in Japan ?：Quantitative Analysis of Suicide Ideation
  • ジサツ ワ デンセン スル カ? : ジサツ ネンリョ ノ ケイリョウ ブンセキ カラ

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This article examines how suicides influence suicide risks of others in Japan. Suicide contagion is the exposure to suicides or suicidal behaviors within one’s family, one’s peer group, or through media reports of suicides and can result in an increase in suicide and suicidal behaviors. Previous studies have shown that suicides or suicidal behaviors spread through media reports of suicide and social ties. But, we have little empirical evidence about the suicide contagion through social ties in Japanese society. Accordingly, we examine the effect of other’s suicides and suicide attempts on suicide ideation by analyzing web survey data. The analysis reveals that the exposure to suicides and suicide attempts within one’s family and one’s peer group influence suicide ideation risks. In contrast, suicide ideation risks are unaffected by suicide and suicide attempts of the relatives and acquaintances. Suicide risks hence spread through social ties of family and peers. These results imply that social ties don’t always protective against suicide. It seems that social ties have a negative impact on human well-being.

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