I just think the SC ideation rate for non stutterers will be also pretty high. I read once that almost 100% of people think at least once in their life about suicide. But still, I can imagine the stutteres think often about it. Maybe just a thought that helps them in the moment, nothing serious. I felt sometime like a shit and the ideation "helped" me. Then I went to the bed and the next day I felt a little bit better. So nothing serious in my case, fortunatelly. The more interesting statistic would be therefore the actually SC rate for stuttereres.