Sleep Apnea question....CPAP set at 6, how severe is that?

I am not sure how the ratings go as far as the settings for a CPAP machine, mine will be set on 6 and I was wondering what is the lowest and highest settings and how severe/mild it is to be set at a 6. Thanks!

We greatly appreciate your interest in helping us build our Q&A database. To discourage vandals from posting garbage, however, we require people to register before posting.