I’ve wondered this as well, why the normative SNA and SNB angles don’t differ between the sexes, but perhaps since these are numbers relative to the rest of the skull structure perhaps men and women do indeed have similar SNA and SNB angles afterall. Absolute jaw length is obviously a different story.
Do SNA and SNB angles even mean anything? Isn’t the best way to determine jaw position just to see how the lips and chin line up with the TVL dropped from subnaison?
For example my SNA is 81.84 and SNB is 81, which could indicate that I could use some more projection, but my lips and chin line up with the TVL pretty well, so further projection could skew proportions in relation to my nose.