I don't know of a stat that breaks it out for climbing vs ground work. By far, there are more injuries to the left side of the body than the right. I would suspect that most aerial cuts are on the left hand/wrist, left shoulder, left tricep area, left chest, and neck. Keep both hands on the chainsaw and almost all of the cuts would not happen.
The new ANSI does not require chainsaw protection aloft, though for the life of me, I don't know why.