I'll bite on the MW attended vs UC, and perhaps get flamed...
I think that for the general population a MW assisted birth is safer than a UC. For most of us on MDC I think that we're well researched as to obstetrical emergencies, have someone willing to help us if the need arises, and wouldn't hessitate to go to a hospital if our baby was in danger. I don't know what a MW would be able to tell me that I couldn't research myself and figure out, and that's why I think she would only inhibit the normal process of birth for me.
My feelings of the general population are that they are not interested in researching for themselves the different complications that could arise in birth, so they may not know that if baby's shoulders are stuck then get on your hands and knees, but rather would keep trying to push baby out flat on their back, as that's all they've seen. They might not know that muconium could signal fetal distress, breech baby, or that it's important to keep baby from breathing it in, ya know? The general population seems to like to rely on professionals to do things for them, and would probably panic in a lot of normal birth situatons, so having a MW there to reassure them would in fact be safer.
I'd never really recommend that anyone UC unless they were the kind of person who did research a ton. I don't think UC is for people who would rather blindly follow. But that's just my opinion. I know there are plenty on this board who think that UC is for everyone and you have intuition that will happen at the birth (and never having given birth, I can't really comment on that).
This all sorta goes beyond statistics and is more thoretical, I guess.