"While there is no definitive evidence that bullying makes kids more likely to kill themselves, now that we see there's a likely association, we can act on it and try to prevent it," said review lead author Young-Shin Kim, M.D., assistant professor at Yale School of Medicine's Child Study Center.
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In the review, Kim and colleague Bennett Leventhal, M.D., analyzed 37 studies that examined bullying and suicide among children and adolescents. The studies took place in the United States, Canada, several European countries (including the United Kingdom and Germany), South Korea, Japan and South Africa.
Almost all of the studies found connections between being bullied and suicidal thoughts among children. Five reported that bullying victims were two to nine times more likely to report suicidal thoughts than other children were.
Not just the victims were in danger: "The perpetrators who are the bullies also have an increased risk for suicidal behaviors," Kim said.