You're just as well to be googling for medical case studies. This site will never be as good as that--it is good for trading information, for validation and emotional support.
But if you want to know the lethality of the variations on any particular method, you really want case studies. You'll get info as specific as, for cutting, which vessels were cut, which implements discovered on scene, position of the body, toxicology, the anatomy of the cut (not a doctor but I mean subtle things like is it cut all the way through, long or cross wise, etc)
All of the case study reading I've done has come from looking for images of bodies after suicide. Take that as you will--i am sure you can google "suicide case studies" and find some that way. You'll probably see some things, though. You will end up in the realm of science.
PS: I trust that case studies will have you pursuing different avenues of death... by that reading, I look at ligature fondly. But I am a mondo coward so maybe I just starve.