But that’s not, what they were asked. They were asked about their perception of bullying, so also bullying of others, not only of themselves. I agree, that it would be much better evidence, if they would have just asked if the students get bullied.
My problem with the perception thing is that everyone tells you, that school uniforms help against bullying and then you get school uniforms. So now you might feel, that there’s less bullying, because you have this foregone conclusion, that it must work.