I found this recently-published article, Children who are bullied suffer worse long-term mental health problems than those who are maltreated interesting. Here are some excerpts:
A new study published in The Lancet Psychiatry shows that children who have been bullied by peers suffer worse in the longer term than those who have been maltreated by adults.
The research is led by Professor Dieter Wolke from Warwick's Department of Psychology and Warwick Medical School. The study is due to be presented at the Pediatric Academic Societies (PAS) annual meeting in San Diego on Tuesday 28 April.
[...] Professor Wolke said: "The mental health outcomes we were looking for included anxiety, depression or suicidal tendencies. Our results showed those who were bullied were more likely to suffer from mental health problems than those who were maltreated. Being both bullied and maltreated also increased the risk of overall mental health problems, anxiety and depression in both groups."
An abstract and full article (pdf) are available.
(Score: 5, Informative) by Marand on Monday May 04 2015, @04:32PM
[1] Not that bullies even need that much of a reason. I remember a girl in high school that went around punching guys for no reason other than a belief that she could do it without retaliation. She'd even tell people "you can't hit me back, I'm a girl" while doing it, and teachers ignored it because apparently lacking a penis equals diplomatic immunity.
I should add, though it's veering off-topic a bit, that the worst part about this was that she was right. Nobody would retaliate because we'd all had "never hit girls" drilled into us and enforced by the teachers, so even the asshole bullies wouldn't hit her back.
Eventually, when she tried it on me, all I did was grab her arm to stop the punch and give it a twist, doing a basic takedown I'd learned before that didn't cause any harm, and I got in trouble for it. Not her for punching with full force, no. I did for non-violent self defense with witnesses.
Moral of the story: sometimes the teachers are part of the problem.